Photographing optical lens assembly, image capturing unit and electronic device

ABSTRACT

A photographing optical lens assembly includes lens elements including, in order from an object to an image side, a first lens group, a second lens group and a third lens group. The first lens group includes a first lens element and a second lens element. The second lens group includes a third lens element, a fourth lens element and a fifth lens element. The third lens group includes a sixth lens element, a seventh lens element and an eighth lens element. The first lens element has positive refractive power. The seventh lens element has an object-side surface and an image-side surface being both aspheric. The eighth lens element has an image-side surface being concave in a paraxial region thereof, wherein both an object-side surface and the image-side surface thereof are aspheric, and the image-side surface of the eighth lens element has at least one reflection point.

RELATED APPLICATIONS

This application is a continuation patent application of U.S.application Ser. No. 14/919,102, filed Oct. 21, 2015, which claimspriority to Taiwan Application 104126121, filed Aug. 11, 2015, which isincorporated by reference herein in its entirety.

BACKGROUND Technical Field

The present disclosure relates to a photographing optical lens assembly,an image capturing unit and an electronic device, more particularly to aphotographing optical lens assembly and an image capturing unitapplicable to an electronic device.

Description of Related Art

In recent years, with the popularity of electronic devices having camerafunctionalities, the demand of miniaturized optical systems has beenincreasing. The sensor of a conventional optical system is typically aCCD (Charge-Coupled Device) or a CMOS (ComplementaryMetal-Oxide-Semiconductor) sensor. As the advanced semiconductormanufacturing technologies have reduced the pixel size of sensors, andcompact optical systems have gradually evolved toward the field ofhigher megapixels, there is an increasing demand for compact opticalsystems featuring better image quality.

A conventional optical system employed in a portable electronic productmainly adopts a lens structure with fewer lens elements. Due to thepopularity of mobile terminals with high-end specifications, such assmartphones, wearable devices and tablet personal computers, therequirements for high resolution and image quality increasesignificantly. With the popularity of the compact optical systems in theelectronic devices, the demand of good image quality is also higher dueto the advancement of the image sensor and software in the high-endelectronic device. Thus, the conventional optical system does not meetthe requirements of good image quality and compact size simultaneously.

SUMMARY

According to one aspect of the present disclosure, a photographingoptical lens assembly includes lens elements including, in order from anobject side to an image side, a first lens group, a second lens groupand a third lens group. The first lens group includes a first lenselement and a second lens element. The second lens group includes athird lens element, a fourth lens element, and a fifth lens element. Thethird lens group includes a sixth lens element, a seventh lens elementand an eighth lens element. The first lens element has positiverefractive power. Both an object-side surface and an image-side surfaceof the seventh lens element are aspheric. The eighth lens element has animage-side surface being concave in a paraxial region thereof. Both anobject-side surface and the image-side surface of the eighth lenselement are aspheric. The image-side of the eighth lens element has atleast one inflection point. There is an air gap in a paraxial regionbetween every two lens elements of the third lens group that areadjacent to each other along an optical axis of the photographingoptical lens assembly. When a focal length of the photographing opticallens assembly is f, a curvature radius of the image-side surface of theeighth lens element is R16, the following condition is satisfied:0<f/R16<6.5.

According to another aspect of the present disclosure, an imagecapturing unit includes the aforementioned photographing optical lensassembly and an image sensor, wherein the image sensor is disposed onthe image side of the photographing optical lens assembly.

According to still another aspect of present disclosure, an electronicdevice includes the aforementioned image capturing unit.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure can be more understood by reading the following detaileddescription of the embodiments, with reference made to the accompanyingdrawings as follows:

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure;

FIG. 2 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 1stembodiment;

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure;

FIG. 4 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 2ndembodiment;

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure;

FIG. 6 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 3rdembodiment;

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure;

FIG. 8 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 4thembodiment;

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure;

FIG. 10 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 5thembodiment;

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure;

FIG. 12 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 6thembodiment;

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure;

FIG. 14 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 7thembodiment;

FIG. 15 is a schematic view of an image capturing unit according to the8th embodiment of the present disclosure;

FIG. 16 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 8thembodiment;

FIG. 17 is a schematic view of an image capturing unit according to the9th embodiment of the present disclosure;

FIG. 18 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 9thembodiment;

FIG. 19 is a schematic view of an image capturing unit according to the10th embodiment of the present disclosure;

FIG. 20 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 10thembodiment;

FIG. 21 is a schematic view of an image capturing unit according to the11th embodiment of the present disclosure;

FIG. 22 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 11thembodiment;

FIG. 23 is a schematic view of an image capturing unit according to the12th embodiment of the present disclosure;

FIG. 24 shows spherical aberration curves, astigmatic field curves and adistortion curve of the image capturing unit according to the 12thembodiment;

FIG. 25 is a schematic view of BL, TL, Y11, Y82, Yc7 and Yc82 in FIG. 1;

FIG. 26 shows an electronic device according to one embodiment;

FIG. 27 shows an electronic device according to another embodiment; and

FIG. 28 shows an electronic device according to still anotherembodiment.

DETAILED DESCRIPTION

A photographing optical lens assembly includes lens elements including,in order from an object side to an image side, a first lens group, asecond lens group and a third lens group. The first lens group includesa first lens element and a second lens element. The second lens groupincludes a third lens element, a fourth lens element and a fifth lenselement. The third lens group includes a sixth lens element, a seventhlens element and an eighth lens element.

There is an air gap in a paraxial region between every two lens elementsof the third lens group that are adjacent to each other; that is, eachlens element of the third lens group is a single and non-cemented lenselement. Moreover, the manufacturing process of the cemented lenses ismore complex than the non-cemented lenses. In particular, an image-sidesurface of one lens element and an object-side surface of the followinglens element need to have accurate curvature to ensure these two lenselements will be highly cemented. However, during the cementing process,those two lens elements might not be highly cemented due to displacementand it is thereby not favorable for the image quality. Therefore, thereis an air gap in a paraxial region between every two lens elements ofthe third lens group that are adjacent to each other in the presentdisclosure for avoiding problems with cemented lens elements. Inaddition, the air gap in the paraxial region between every two lenselements of the first lens group, the second lens group and the thirdlens group that are adjacent to each other can be constant; that is,each lens elements of the photographing optical lens assembly in theparaxial region can be stationary relative to each other.

The first lens group can have positive refractive power, the second lensgroup can have positive refractive power, and the third lens group canhave negative refractive power. Therefore, it is favorable for applyingthe photographing optical lens assembly to the electronic devices havingdifferent sizes and different requirements of image resolution.

The first lens element of the first lens group has positive refractivepower. Therefore, it is favorable for providing the needed positiverefractive power while reducing a total track length in thephotographing optical lens assembly.

The second lens element of the first lens group can have negativerefractive power. The second lens element can have an object-sidesurface being convex in a paraxial region thereof and an image-sidesurface being concave in a paraxial region thereof. Therefore, it isfavorable for correcting the aberration of the first lens element so asto improve the image quality.

The third, fourth and fifth lens elements of the second lens group andthe sixth lens element of the third lens group can have positive ornegative refractive power. Therefore, it is favorable for distributingthe refractive power of the photographing optical lens assembly whilecorrecting aberrations.

The seventh lens element of the third lens group can have positive ornegative refractive power. The seventh lens element can have anobject-side surface being convex in a paraxial region thereof and animage-side surface being concave in a paraxial region thereof.Therefore, it is favorable with the principal point being positionedaway from the image side of the photographing optical lens assembly forreducing a back focal length so as to maintain a compact size thereof.

The eighth lens element of the third lens group can have negativerefractive power. The eighth lens element can have an object-sidesurface being convex in a paraxial region thereof and an image-sidesurface being concave in a paraxial region thereof. The image-sidesurface of the eighth lens element has at least one inflection point.Therefore, it is favorable for reducing the incident angle of the lighton the image sensor so as to improve the image-sensing efficiency, andthereby correcting aberrations of the off-axis field.

According to the present disclosure, the photographing optical lensassembly includes the first lens group, the second lens group and thethird lens group. Therefore, the refractive power distribution of thefirst lens group, the second lens group and the third lens group isfavorable for adjusting the design parameters of the photographingoptical lens assembly. Furthermore, it is favorable for correctingaberrations. For example, when both the first lens element and thesecond lens element have positive refractive power with the first lensgroup having positive refractive power, it is favorable for the firstand second lens elements having proper refractive power distributionwhile reducing the sensitivity of the photographing optical lensassembly. Also, when the first lens element has positive refractivepower and the second lens element has negative refractive power, thefirst lens element and the second lens element with opposite refractivepower are favorable for correcting aberrations.

When a focal length of the photographing optical lens assembly is f, acurvature radius of the image-side surface of the eighth lens element isR16, the following condition is satisfied: 0<f/R16<6.5. Therefore, it isfavorable for reducing the back focal length of the photographingoptical lens assembly so as to maintain a compact size thereof.Preferably, the following condition can also be satisfied:0.3<f/R16<5.0. More preferably, the following condition can also besatisfied: 1.0<f/R16<4.5.

According to the present disclosure, the photographing optical lensassembly further includes a stop. When an axial distance between thestop and an image-side surface of the lens element closest to an imagesurface is SD, an axial distance between an object-side surface of thelens element closest to an imaged object and the image-side surface ofthe lens element closest to the image surface is TD, the followingcondition can be satisfied: 0.70<SD/TD<1.10. Therefore, it is favorablefor properly placing the stop to provide sufficient field of view andobtain a balance between the total track length and the incident angleof the light on the image sensor.

The photographing optical lens assembly may include one or moreadditional lens elements in any of the three lens groups to furtherenhance the image quality. That is, the photographing optical lensassembly may have more than eight lens elements.

When a maximum refractive index among the lens elements of thephotographing optical lens assembly is Nmax, the following condition canbe satisfied: 1.55<Nmax<1.70. Therefore, it is favorable for designingthe lens elements with more flexibility so as to correct the opticalcharacteristics of the lens elements and improve the image quality.

When an Abbe number of the first lens element is V1, an Abbe number ofthe second lens element is V2, an Abbe number of the sixth lens elementis V6, the following condition can be satisfied: (V2+V6)/V1<1.0.Therefore, the photographing optical lens assembly has balanced thecapability for correcting chromatic aberration at both the object sideand the image side.

When an axial distance between the object-side surface of the lenselement closest to the imaged object and the image surface is TL, amaximum image height of the photographing optical lens assembly (half ofa diagonal length of an effective photosensitive area of the imagesensor) is ImgH, the following condition can be satisfied: TL/ImgH<2.1.Therefore, it is favorable for simultaneously satisfying the requirementof compact size and a large image surface so as to apply thephotographing optical lens assembly to electronic devices with highimage resolution specifications. As seen in FIG. 25, FIG. 25 shows aschematic view of TL in FIG. 1. In FIG. 1, the first lens element is thelens element closest to the imaged object in this embodiment.

When the axial distance between the object-side surface of the lenselement closest to the imaged object and the image surface is TL, anentrance pupil diameter of the photographing optical lens assembly isEPD, the following condition can be satisfied: 1.5<TL/EPD<4.0.Therefore, it is favorable for reducing the total track length of thephotographing optical lens assembly and obtaining the characteristics ofcompactness and a large aperture.

When half of a maximal field of view of the photographing optical lensassembly is HFOV, the following condition can be satisfied: 30.0degrees<HFOV<50.0 degrees. Therefore, it is favorable for providing thephotographing optical lens assembly with proper field of view.

When the focal length of the photographing optical lens assembly is f, afocal length of the first lens element is f1, the following conditioncan be satisfied: 0<f/f1<2.5. Therefore, the refractive power at theobject side of the photographing optical lens assembly is sufficient forfocusing the light rays, and thereby reducing the total track length.Preferably, the following condition can also be satisfied: 0<f/f1<1.5.

When the axial distance between the object-side surface of the lenselement closest to the imaged object and the image surface is TL, thefollowing condition can be satisfied: TL<12.0 mm. Therefore, it isfavorable for reducing the total track length so as to obtaincompactness.

When a curvature radius of the object-side surface of the eighth lenselement is R15, the curvature radius of the image-side surface of theeighth lens element is R16, the following condition can be satisfied:−0.9<(R15−R16)/(R15+R16)<10. Therefore, it is favorable for preventingthe refractive power at the image side of the photographing optical lensassembly from overly strong and effectively correcting the astigmatism.Preferably, the following condition can also be satisfied:−0.5<(R15−R16)/(R15+R16)<2.5.

When a maximum effective radius of the object-side surface of the firstlens element is Y11, a maximum effective radius of the image-sidesurface of the eighth lens element is Y82, the following condition canbe satisfied: 0.20<Y11/Y82<0.70. Therefore, it is favorable for keep thephotographing optical lens assembly compact and enlarging the field ofview, and thereby satisfying the requirements of convenience andmultifunction. As seen in FIG. 25, FIG. 25 shows a schematic view of Y11and Y82 in FIG. 1.

When a maximum axial distance among all axial distances between everytwo lens elements of the photographing optical lens assembly that areadjacent to each other is ATmax, the maximum image height of thephotographing optical lens assembly is ImgH, the following condition canbe satisfied: ATmax/ImgH<0.30. Therefore, it is favorable for arrangingthe size of each lens element so as to keep the photographing opticallens assembly compact.

When the focal length of the photographing optical lens assembly is f,the entrance pupil diameter of the photographing optical lens assemblyis EPD, the following condition can be satisfied: f/EPD<2.60. Therefore,it is favorable for providing sufficient amount of incident light so asto improve the image quality.

When the focal length of the first lens element is f1, a focal length ofthe second lens element is f2, the following condition can be satisfied:−1.0<f1/f2<0.7. Therefore, the refractive power at the object side ofthe photographing optical lens assembly is sufficient for maintaining acompact size thereof.

When an axial distance between the image-side surface of the lenselement closest to the image surface and the image surface is BL, andthe entrance pupil diameter of the photographing optical lens assemblyis EPD, the following condition can be satisfied: 0.10<BL/EPD<0.70.Therefore, it is favorable for controlling the back focal length and theentrance pupil to reduce the back focal length and to obtain thebrightness simultaneously. As seen in FIG. 25, FIG. 25 shows a schematicview of BL in FIG. 1. In FIG. 1, the eighth lens element is the lenselement closest to the image surface of the photographing optical lensassembly in this embodiment.

When a sum of every axial distance between every two lens elements ofthe photographing optical lens assembly that are adjacent to each otheris ΣAT, the axial distance between the image-side surface of the lenselement closest to the image surface and the image surface is BL, a sumof central thicknesses of the lens elements of the photographing opticallens assembly is ΣCT, the following condition can be satisfied:(ΣAT+BL)/ΣCT<0.80. Therefore, it is favorable for tightly arranging thelens elements for compactness.

When a curvature radius of an object-side surface of the sixth lenselement is R11, a curvature radius of an image-side surface of the sixthlens element is R12, the following condition can be satisfied:−2.5<(R11−R12)/(R11+R12)<0.80. Therefore, it is favorable for correctingthe astigmatism and Petzval's Sum.

When a vertical distance between a non-axial critical point on theobject-side surface or the image-side surface of the seventh lenselement and an optical axis is Yc7, the focal length of thephotographing optical lens assembly is f, the following condition can besatisfied: 0.10<Yc7/f<0.60. Therefore, it is favorable for correctingthe aberration of the off-axis field so as to improve the image qualityat the off-axis region. Please refer to FIG. 25, FIG. 25 shows aschematic view of Yc7 in FIG. 1. A non-axial critical point is notlocated on the optical axis and its tangent is perpendicular to theoptical axis. In FIG. 25, the non-axial critical point of the seventhlens element is located on the object-side surface, and there is nocritical point on the image-side surface of the seventh lens element,but the present disclosure is not limited thereto. For example, both ofthe two surfaces of the seventh lens element can have critical point,and vertical distances between the critical points and the optical axisare both Yc7.

When a vertical distance between a non-axial critical point on theimage-side surface of the eighth lens element and the optical axis isYc82, the focal length of the photographing optical lens assembly is f,the following condition can be satisfied: 0.10<Yc82/f<0.80. Therefore,it is favorable for arranging the shape of the lens element at the imageside so as to correct aberrations and increase relative illumination,and thereby improving the resolution at the off-axis region of theimage. Please refer to FIG. 25, which is schematic view of Yc82 in FIG.1.

According to the present disclosure, the first lens element can have thestrongest refractive power among the lens elements of the photographingoptical lens assembly, that is, the absolute value of the refractivepower of the first lens element is the greatest among the lens elementsof the photographing optical lens assembly. Therefore, it is favorablefor effectively reducing the back focal length of the photographingoptical lens assembly.

When the focal length of the photographing optical lens assembly is f, afocal length of the first lens group is fG1, a focal length of thesecond lens group is fG2, and a focal length of the third lens group isfG3, the following conditions can be satisfied: 0.1<f/fG1<2.0;−0.4<f/fG2<0.8; and −1.0<f/fG3<1.0. Therefore, the photographing opticallens assembly is favorably to be applied to different kinds ofelectronic devices by the refractive power distributions of the firstlens group, the second lens group and the third lens group.

When the focal length of the photographing optical lens assembly is f, afocal length of the seventh lens element is f7, the following conditioncan be satisfied: −1.0<f/f7<2.8. Therefore, it is favorable forproviding sufficient refractive power at the image side of thephotographing optical lens assembly so as to balance the arrangement ofthe lens elements of the photographing optical lens assembly, andthereby improving the image quality.

When the focal length of the photographing optical lens assembly is f, afocal length of the eighth lens element is f8, the following conditioncan be satisfied: −2.8<f/f8<1.0. Therefore, it is favorable forcorrecting the distortion at the off-axis region of the image, andthereby improving the image quality.

When a central thickness of the third lens element is CT3, a centralthickness of the fourth lens element is CT4, the following condition canbe satisfied: 0.1<CT3/CT4<4.0. Therefore, it provides favorablemoldability and homogeneity during the injection molding process.

When a central thickness of the seventh lens element is CT7, a centralthickness of the eighth lens element is CT8, the following condition canbe satisfied: 0.3<CT7/CT8<4.0. Therefore, it provides favorablemoldability and homogeneity at the image side during the injectionmolding process.

When an axial distance between the second lens element and the thirdlens element is T23, an axial distance between the fifth lens elementand the sixth lens element is T56, the following condition can besatisfied: 0.03<T23/T56<6.00. Therefore, it is favorable for assemblingthe lens elements with a higher manufacturing yield rate.

When the axial distance between the second lens element and the thirdlens element is T23, an axial distance between the seventh lens elementand the eighth lens element is T78, the following condition can besatisfied: 0.03<T23/T78<3.0. Therefore, it is favorable for providingsufficient space between the adjacent lens elements so that thecurvatures of the lens elements are more flexible to design, and therebyimproving the capability for correcting aberrations at the off-axisfield.

According to the present disclosure, an aperture stop can be configuredas a front stop or a middle stop. A front stop disposed between animaged object and the first lens element can produce a telecentriceffect by providing a longer distance between an exit pupil and theimage surface and thereby improving the image-sensing efficiency of animage sensor (for example, CCD or CMOS). A middle stop disposed betweenthe first lens element and the image surface is favorable for enlargingthe view angle and thereby provides a wider field of view.

According to the present disclosure, the lens elements of thephotographing optical lens assembly can be made of glass or plasticmaterial. When the lens elements are made of glass material, therefractive power distribution of the photographing optical lens assemblymay be more flexible to design. When the lens elements are made ofplastic material, the manufacturing cost can be effectively reduced.Furthermore, surfaces of each lens element can be arranged to beaspheric, since the aspheric surface of the lens element is easy to forma shape other than spherical surface so as to have more controllablevariables for eliminating the aberration thereof, and to furtherdecrease the required number of the lens elements. Therefore, the totaltrack length of the photographing optical lens assembly can also bereduced.

According to the present disclosure, each of an object-side surface andan image-side surface has a paraxial region and an off-axis region. Theparaxial region refers to the region of the surface where light raystravel close to the optical axis, and the off-axis region refers to theregion of the surface away from the paraxial region. Particularly, whenthe lens element has a convex surface, it indicates that the surface canbe convex in the paraxial region thereof; when the lens element has aconcave surface, it indicates that the surface can be concave in theparaxial region thereof. Moreover, when a region of refractive power orfocus of a lens element is not defined, it indicates that the region ofrefractive power or focus of the lens element can be in the paraxialregion thereof.

According to the present disclosure, an image surface of thephotographing optical lens assembly, based on the corresponding imagesensor, can be flat or curved, especially a curved surface being concavefacing towards the object side of the photographing optical lensassembly.

According to the present disclosure, the photographing optical lensassembly can include at least one stop, such as an aperture stop, aglare stop or a field stop. Said glare stop or said field stop isallocated for eliminating the stray light and thereby improving theimage quality thereof.

According to the present disclosure, an image capturing unit isprovided. The image capturing unit includes the photographing opticallens assembly according to the aforementioned photographing optical lensassembly of the present disclosure, and an image sensor, wherein theimage sensor is disposed on the image side of the aforementionedphotographing optical lens assembly, that is, the image sensor can bedisposed on or near an image surface of the aforementioned photographingoptical lens assembly. In some embodiments, the image capturing unit canfurther include a barrel member, a holding member or a combinationthereof.

In FIG. 26, FIG. 27, and FIG. 28, an image capturing unit 10 may beinstalled in, but not limited to, an electronic device, including asmart phone (FIG. 26), a tablet personal computer (FIG. 27) or awearable device (FIG. 28). The electronic devices shown in the figuresare only exemplary for showing the image capturing unit of the presentdisclosure installed in an electronic device and are not limitedthereto. In some embodiments, the electronic device can further include,but not limited to, a display unit, a control unit, a storage unit, arandom access memory unit (RAM), a read only memory unit (ROM) or acombination thereof.

According to the present disclosure, the photographing optical lensassembly can be optionally applied to optical systems with a movablefocus. Furthermore, the photographing optical lens assembly is featuredwith good capability in the aberration correction and high imagequality, and can be applied to 3D (three-dimensional) image capturingapplications, in products such as digital cameras, mobile devices,digital tablets, wearable devices, smart televisions, networksurveillance devices, motion sensing input devices, dashboard cameras,vehicle backup cameras and other electronic imaging devices. Accordingto the above description of the present disclosure, the followingspecific embodiments are provided for further explanation.

1st Embodiment

FIG. 1 is a schematic view of an image capturing unit according to the1st embodiment of the present disclosure. FIG. 2 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 1stembodiment. In FIG. 1, the image capturing unit includes thephotographing optical lens assembly (its reference numeral is omitted)of the present disclosure and an image sensor 197. The photographingoptical lens assembly includes, in order from an object side to an imageside, an aperture stop 100, a first lens element 110, a second lenselement 120, a third lens element 130, a fourth lens element 140, afifth lens element 150, a sixth lens element 160, a seventh lens element170, an eighth lens element 180, an IR-cut filter 190 and an imagesurface 195. A first lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the first lens element 110and the second lens element 120. A second lens group (reference numeralis omitted) of the photographing optical lens assembly includes thethird lens element 130, fourth lens element 140 and the fifth lenselement 150. A third lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the sixth lens element 160,the seventh lens element 170 and the eighth lens element 180. The imagesensor 197 is disposed on or near the image surface 195 of thephotographing optical lens assembly, and the photographing optical lensassembly has a total of eight lens elements (110-180). There is an airgap in a paraxial region between every two lens elements of the thirdlens group that are adjacent to each other. In this embodiment, thefirst lens group has positive refractive power, the second lens grouphas positive refractive power, and the third lens group has negativerefractive power.

The first lens element 110 with positive refractive power has anobject-side surface 111 being convex in a paraxial region thereof and animage-side surface 112 being concave in a paraxial region thereof. Thefirst lens element 110 is made of plastic material and has theobject-side surface 111 and the image-side surface 112 being bothaspheric.

The second lens element 120 with negative refractive power has anobject-side surface 121 being convex in a paraxial region thereof and animage-side surface 122 being concave in a paraxial region thereof. Thesecond lens element 120 is made of plastic material and has theobject-side surface 121 and the image-side surface 122 being bothaspheric.

The third lens element 130 with positive refractive power has anobject-side surface 131 being convex in a paraxial region thereof and animage-side surface 132 being convex in a paraxial region thereof. Thethird lens element 130 is made of plastic material and has theobject-side surface 131 and the image-side surface 132 being bothaspheric.

The fourth lens element 140 with negative refractive power has anobject-side surface 141 being concave in a paraxial region thereof andan image-side surface 142 being convex in a paraxial region thereof. Thefourth lens element 140 is made of plastic material and has theobject-side surface 141 and the image-side surface 142 being bothaspheric.

The fifth lens element 150 with negative refractive power has anobject-side surface 151 being concave in a paraxial region thereof andan image-side surface 152 being convex in a paraxial region thereof. Thefifth lens element 150 is made of plastic material and has theobject-side surface 151 and the image-side surface 152 being bothaspheric.

The sixth lens element 160 with negative refractive power has anobject-side surface 161 being concave in a paraxial region thereof andan image-side surface 162 being convex in a paraxial region thereof. Thesixth lens element 160 is made of plastic material and has theobject-side surface 161 and the image-side surface 162 being bothaspheric.

The seventh lens element 170 with positive refractive power has anobject-side surface 171 being convex in a paraxial region thereof and animage-side surface 172 being convex in a paraxial region thereof. Theseventh lens element 170 is made of plastic material and has theobject-side surface 171 and the image-side surface 172 being bothaspheric.

The eighth lens element 180 with negative refractive power has anobject-side surface 181 being convex in a paraxial region thereof and animage-side surface 182 being concave in a paraxial region thereof. Theeighth lens element 180 is made of plastic material and has theobject-side surface 181 and the image-side surface 182 being bothaspheric. The image-side surface 182 has at least one inflection point.

The IR-cut filter 190 is made of glass and located between the eighthlens element 180 and the image surface 195, and will not affect thefocal length of the photographing optical lens assembly.

The equation of the aspheric surface profiles of the aforementioned lenselements of the 1st embodiment is expressed as follows:

${{X(Y)} = {{\left( {Y^{2}/R} \right)/\left( {1 + {{sqrt}\left( {1 - {\left( {1 + k} \right) \times \left( {Y/R} \right)^{2}}} \right)}} \right)} + {\sum\limits_{i}{({Ai}) \times \left( Y^{i} \right)}}}},$

where,

X is the relative distance between a point on the aspheric surfacespaced at a distance Y from an optical axis and the tangential plane atthe aspheric surface vertex on the optical axis;

Y is the vertical distance from the point on the aspheric surface to theoptical axis;

R is the curvature radius;

k is the conic coefficient; and

Ai is the i-th aspheric coefficient, and in the embodiments, i may be,but is not limited to, 4, 6, 8, 10, 12, 14 and 16.

In the photographing optical lens assembly of the image capturing unitaccording to the 1st embodiment, when a focal length of thephotographing optical lens assembly is f, an f-number of thephotographing optical lens assembly is Fno, and half of a maximal fieldof view of the photographing optical lens assembly is HFOV, theseparameters have the following values: f=3.75 millimeters (mm); Fno=1.90;and HFOV=36.8 degrees (deg.).

When a maximum refractive index among the lens elements of thephotographing optical lens assembly is Nmax, the following condition issatisfied: Nmax=1.639. In this embodiment, Nmax is a maximum refractiveindex among the first lens element 110, the second lens element 120, thethird lens element 130, the fourth lens element 140, the fifth lenselement 150, the sixth lens element 160, the seventh lens element 170and the eighth lens element 180.

When an Abbe number of the first lens element 110 is V1, an Abbe numberof the second lens element 120 is V2, an Abbe number of the sixth lenselement is V6, the following condition is satisfied: (V2+V6)/V1=0.84.

When a curvature radius of the object-side surface 161 of the sixth lenselement 160 is R11, a curvature radius of the image-side surface 162 ofthe sixth lens element 160 is R12, the following condition is satisfied:(R11−R12)/(R11+R12)=−0.13.

When a curvature radius of the object-side surface 181 of the eighthlens element 180 is R15, a curvature radius of the image-side surface182 of the eighth lens element 180 is R16, the following condition issatisfied: (R15−R16)/(R15+R16)=0.77.

When the focal length of the photographing optical lens assembly is f,the curvature radius of the image-side surface 182 of the eighth lenselement 180 is R16, the following condition is satisfied: f/R16=2.61.

When the focal length of the photographing optical lens assembly is f, afocal length of the first lens element 110 is f1, the followingcondition is satisfied: f/f1=1.11.

When the focal length of the first lens element 110 is f1, a focallength of the second lens element 120 is f2, the following condition issatisfied: f1/f2=−0.56.

When a maximum effective radius of the object-side surface 111 of thefirst lens element 110 is Y11, a maximum effective radius of theimage-side surface 182 of the eighth lens element 180 is Y82, thefollowing condition is satisfied: Y11/Y82=0.43.

When an axial distance between the stop 100 and an image-side surface ofthe lens element closest to the image surface 195 is SD, an axialdistance between an object-side surface of the lens element closest toan imaged object and the image-side surface of the lens element closestto the image surface 195 is TD, the following condition is satisfied:SD/TD=0.92. In this embodiment, SD is an axial distance between the stop100 and the image side-surface 182 of the eighth lens element 180, andTD is an axial distance between the object-side surface 111 of the firstlens element 110 and the image side-surface 182 of the eighth lenselement 180.

When a maximum axial distance among all axial distances between everytwo lens elements of the photographing optical lens assembly that areadjacent to each other is ATmax, a maximum image height of thephotographing optical lens assembly is ImgH, the following condition issatisfied: ATmax/ImgH=0.11. In this embodiment, ATmax is a maximum axialdistance among axial distances between every two first lens element 110,the second lens element 120, the third lens element 130, the fourth lenselement 140, the fifth lens element 150, the sixth lens element 160, theseventh lens element 170 and the eighth lens element 180 that areadjacent to each other.

When the focal length of the photographing optical lens assembly is f,an entrance pupil diameter of the photographing optical lens assembly isEPD, the following condition is satisfied: f/EPD=1.90.

When an axial distance between the image-side surface of the lenselement closest to the image surface 195 and the image surface 195 isBL, the entrance pupil diameter of the photographing optical lensassembly is EPD, the following condition is satisfied: BL/EPD=0.39. Inthis embodiment, BL is an axial distance between the image-side surface182 of the eighth lens element 180 and the image surface 195.

When an axial distance between the object-side surface of the lenselement closest to the imaged object and the image surface 195 is TL,the entrance pupil diameter of the photographing optical lens assemblyis EPD, the following condition is satisfied: TL/EPD=2.42. In thisembodiment, TL is an axial distance between the object-side surface 111of the first lens element 110 and the image surface 195.

When a sum of every axial distance between every two lens elements ofthe photographing optical lens assembly that are adjacent to each otheris ΣAT, the axial distance between the image-side surface of the lenselement closest to the image surface 195 and the image surface 195 isBL, a sum of central thicknesses of lens elements of the photographingoptical lens assembly is ΣCT, the following condition is satisfied:(ΣAT+BL)/ΣCT=0.59. In this embodiment, ΣAT is a sum of every axialdistance between every two of the first lens element 110, the secondlens element 120, the third lens element 130, the fourth lens element140, the fifth lens element 150, the sixth lens element 160, the seventhlens element 170 and the eighth lens element 180 that are adjacent toeach other, and ΣCT is a sum of central thicknesses of the first lenselement 110 through the eighth lens element 180.

When the axial distance between the object-side surface of the lenselement closest to the imaged object and the image surface 195 is TL,the maximum image height of the photographing optical lens assembly isImgH, the following condition is satisfied: TL/ImgH=1.65.

When the axial distance between the object-side surface of the lenselement closest to the imaged object and the image surface 195 is TL,the following condition is satisfied: TL=4.78 mm.

When a vertical distance between a non-axial critical point on theobject-side surface 171 or the image-side surface 172 of the seventhlens element 170 and an optical axis is Yc7, the focal length of thephotographing optical lens assembly is f, the following condition issatisfied: Yc7/f=0.23. In this embodiment, the non-axial critical pointis located on the object-side surface 171 of the seventh lens element170, and there is no non-axial critical point on the image-side surface172 of the seventh lens element 170.

When a vertical distance between a non-axial critical point on theimage-side surface 182 of the eighth lens element 180 and the opticalaxis is Yc82, the focal length of the photographing optical lensassembly is f, the following condition is satisfied: Yc82/f=0.29.

When the focal length of the photographing optical lens assembly is f, afocal length of the first lens group is fG1, the following condition issatisfied: f/fG1=0.65.

When the focal length of the photographing optical lens assembly is f, afocal length of the second lens group is fG2, the following condition issatisfied: f/fG2=0.45.

When the focal length of the photographing optical lens assembly is f, afocal length of the third lens group is fG3, the following condition issatisfied: f/fG3=−0.41.

When the focal length of the photographing optical lens assembly is f, afocal length of the seventh lens element 170 is f7, the followingcondition is satisfied: f/f7=0.86.

When the focal length of the photographing optical lens assembly is f, afocal length of the eighth lens element 180 is f8, the followingcondition is satisfied: f/f8=−1.20.

When a central thickness of the third lens element 130 is CT3, a centralthickness of the fourth lens element 140 is CT, the following conditionis satisfied: CT3/CT4=1.60.

When a central thickness of the seventh lens element 170 is CT7, acentral thickness of the eighth lens element 180 is CT8, the followingcondition is satisfied: CT7/CT8=2.39.

When an axial distance between the second lens element 120 and the thirdlens element 130 is T23, an axial distance between the fifth lenselement 150 and the sixth lens element 160 is T56, the followingcondition is satisfied: T23/T56=1.46.

When the axial distance between the second lens element 120 and thethird lens element 130 is T23, an axial distance between the seventhlens element 170 and the eighth lens element 180 is T78, the followingcondition is satisfied: T23/T78=0.80.

The detailed optical data of the 1st embodiment are shown in Table 1 andthe aspheric surface data are shown in Table 2 below.

TABLE 1 1st Embodiment f = 3.75 mm, Fno = 1.90, HFOV = 36.8 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.325 2 Lens 1 1.685 (ASP)0.546 Plastic 1.544 55.9 3.37 3 18.567 (ASP) 0.070 4 Lens 2 2.923 (ASP)0.253 Plastic 1.639 23.5 −6.03 5 1.604 (ASP) 0.426 6 Lens 3 6.358 (ASP)0.050 Plastic 1.544 55.9 7.75 7 −12.215 (ASP) 0.266 8 Lens 4 −10.576(ASP) 0.104 Plastic 1.544 55.9 −430.85 9 −11.174 (ASP) 0.251 10 Lens 5−10.367 (ASP) 0.173 Plastic 1.544 55.9 −274.67 11 −11.235 (ASP) 0.220 12Lens 6 −2.060 (ASP) 0.035 Plastic 1.639 23.5 −16.13 13 −2.681 (ASP)0.732 14 Lens 7 3.461 (ASP) 0.317 Plastic 1.544 55.9 4.37 15 −7.055(ASP) 0.306 16 Lens 8 11.111 (ASP) 0.350 Plastic 1.535 55.7 −3.12 171.438 (ASP) 0.546 18 IR-cut filter Plano 0.210 Glass 1.517 64.2 — 19Plano 0.206 20 Image Plano — Note: Reference wavelength is 587.6 nm(d-line).

TABLE 2 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = 1.7681E−01−1.2776E+01 −2.9857E+01 −1.2709E+01 −2.7741E+01 9.0000E+01 A4 =6.5549E−03 −1.3129E−01 −1.6384E−01 1.3995E−01 −9.3270E−03 5.8849E−04 A6= −2.1368E−02 3.6675E−01 4.0304E−01 −2.2455E−01 −4.4137E−03 −1.7985E−02A8 = 5.4198E−02 −4.9085E−01 −5.1213E−01 4.7697E−01 2.5916E−02−4.2249E−03 A10 = −6.4445E−02 3.7784E−01 3.7035E−01 −5.4385E−01−4.1583E−02 −8.5112E−03 A12 = 4.4523E−02 −1.5437E−01 −1.5562E−013.2179E−01 2.6550E−02 — A14 = −1.1704E−02 2.4066E−02 2.6062E−02−6.9334E−02 −2.2918E−03 — Surface # 8 9 10 11 12 13 k = 6.9735E+018.3732E+01 6.2105E+01 7.4238E+01 1.0353E+00 −1.0145E+01 A4 = −2.0966E−02−3.0502E−02 −5.0212E−02 −1.4195E−01 −4.4139E−02 −1.6893E−01 A6 =1.6769E−03 −2.9339E−02 −4.1045E−02 1.1718E−01 2.4240E−01 2.6139E−01 A8 =−7.7153E−03 −3.2530E−03 −2.1920E−02 −1.0703E−01 −4.2265E−01 −3.0327E−01A10 = −1.0660E−03 −6.6123E−03 4.7669E−03 −1.1645E−01 4.0198E−012.1787E−01 A12 = — 1.4550E−04 1.0091E−06 3.1028E−01 −1.7230E−01−8.0449E−02 A14 = — — — −2.0573E−01 2.4455E−02 1.1717E−02 A16 = — — —4.5154E−02 — — Surface # 14 15 16 17 k = −4.8924E+01 −7.9584E+011.4669E+01 −3.1378E+00 A4 = −3.0918E−02 4.9387E−03 −3.4608E−01−2.4817E−01 A6 = 3.7542E−02 1.2692E−02 1.8930E−01 1.6312E−01 A8 =−8.5743E−02 −2.6623E−02 −5.8697E−02 −7.5256E−02 A10 = 5.2991E−021.1128E−02 1.3504E−02 2.2753E−02 A12 = −1.7634E−02 −1.7350E−03−2.2740E−03 −4.1789E−03 A14 = 2.5249E−03 8.2882E−05 2.3106E−044.1494E−04 A16 = — — −1.0250E−05 −1.6950E−05

In Table 1, the curvature radius, the thickness and the focal length areshown in millimeters (mm). Surface numbers 0-20 represent the surfacessequentially arranged from the object-side to the image-side along theoptical axis. In Table 2, k represents the conic coefficient of theequation of the aspheric surface profiles. A4-A16 represent the asphericcoefficients ranging from the 4th order to the 16th order. The tablespresented below for each embodiment are the corresponding schematicparameter and aberration curves, and the definitions of the tables arethe same as Table 1 and Table 2 of the 1st embodiment. Therefore, anexplanation in this regard will not be provided again.

2nd Embodiment

FIG. 3 is a schematic view of an image capturing unit according to the2nd embodiment of the present disclosure. FIG. 4 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 2ndembodiment. In FIG. 3, the image capturing unit includes thephotographing optical lens assembly (its reference numeral is omitted)of the present disclosure and an image sensor 297. The photographingoptical lens assembly includes, in order from an object side to an imageside, a first lens element 210, an aperture stop 200, a second lenselement 220, a third lens element 230, a fourth lens element 240, afifth lens element 250, a sixth lens element 260, a seventh lens element270, an eighth lens element 280, an IR-cut filter 290 and an imagesurface 295. A first lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the first lens element 210and the second lens element 220. A second lens group (reference numeralis omitted) of the photographing optical lens assembly includes thethird lens element 230, fourth lens element 240 and the fifth lenselement 250. A third lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the sixth lens element 260,the seventh lens element 270 and the eighth lens element 280. The imagesensor 297 is disposed on or near the image surface 295 of thephotographing optical lens assembly, and the photographing optical lensassembly has a total of eight lens elements (210-280). There is an airgap in a paraxial region between every two lens elements of the thirdlens group that are adjacent to each other. In this embodiment, thefirst lens group has positive refractive power, the second lens grouphas positive refractive power, and the third lens group has negativerefractive power.

The first lens element 210 with positive refractive power has anobject-side surface 211 being convex in a paraxial region thereof and animage-side surface 212 being concave in a paraxial region thereof. Thefirst lens element 210 is made of plastic material and has theobject-side surface 211 and the image-side surface 212 being bothaspheric.

The second lens element 220 with negative refractive power has anobject-side surface 221 being convex in a paraxial region thereof and animage-side surface 222 being concave in a paraxial region thereof. Thesecond lens element 220 is made of plastic material and has theobject-side surface 221 and the image-side surface 222 being bothaspheric.

The third lens element 230 with positive refractive power has anobject-side surface 231 being convex in a paraxial region thereof and animage-side surface 232 being convex in a paraxial region thereof. Thethird lens element 230 is made of plastic material and has theobject-side surface 231 and the image-side surface 232 being bothaspheric.

The fourth lens element 240 with negative refractive power has anobject-side surface 241 being concave in a paraxial region thereof andan image-side surface 242 being convex in a paraxial region thereof. Thefourth lens element 240 is made of plastic material and has theobject-side surface 241 and the image-side surface 242 being bothaspheric.

The fifth lens element 250 with positive refractive power has anobject-side surface 251 being concave in a paraxial region thereof andan image-side surface 252 being convex in a paraxial region thereof. Thefifth lens element 250 is made of plastic material and has theobject-side surface 251 and the image-side surface 252 being bothaspheric.

The sixth lens element 260 with negative refractive power has anobject-side surface 261 being concave in a paraxial region thereof andan image-side surface 262 being convex in a paraxial region thereof. Thesixth lens element 260 is made of plastic material and has theobject-side surface 261 and the image-side surface 262 being bothaspheric.

The seventh lens element 270 with positive refractive power has anobject-side surface 271 being convex in a paraxial region thereof and animage-side surface 272 being convex in a paraxial region thereof. Thefourth lens element 270 is made of plastic material and has theobject-side surface 271 and the image-side surface 272 being bothaspheric.

The eighth lens element 280 with negative refractive power has anobject-side surface 281 being convex in a paraxial region thereof and animage-side surface 282 being concave in a paraxial region thereof. Theeighth lens element 280 is made of plastic material and has theobject-side surface 281 and the image-side surface 282 being bothaspheric. The image-side surface 282 of the eighth lens element 280 hasat least one inflection point

The IR-cut filter 290 is made of glass and located between the eighthlens element 280 and the image surface 295, and will not affect thefocal length of the photographing optical lens assembly.

The detailed optical data of the 2nd embodiment are shown in Table 3 andthe aspheric surface data are shown in Table 4 below.

TABLE 3 2nd Embodiment f = 3.77 mm, Fno = 1.95, HFOV = 36.7 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 1.696 (ASP) 0.670 Plastic 1.544 56.0 3.412 16.917 (ASP) 0.046 3 Ape. Stop Plano 0.021 4 Lens 2 2.870 (ASP) 0.264Plastic 1.660 20.4 −6.65 5 1.671 (ASP) 0.239 6 Lens 3 7.476 (ASP) 0.398Plastic 1.544 56.0 8.39 7 −11.489 (ASP) 0.059 8 Lens 4 −10.025 (ASP)0.234 Plastic 1.544 56.0 −56.87 9 −14.952 (ASP) 0.110 10 Lens 5 −13.260(ASP) 0.223 Plastic 1.544 56.0 120.26 11 −11.091 (ASP) 0.158 12 Lens 6−2.092 (ASP) 0.253 Plastic 1.660 20.4 −45.32 13 −2.358 (ASP) 0.035 14Lens 7 4.446 (ASP) 0.678 Plastic 1.535 55.7 5.11 15 −6.733 (ASP) 0.31616 Lend 8 11.265 (ASP) 0.322 Plastic 1.535 55.7 −3.00 17 1.391 (ASP)0.350 18 IR-cut filter Plano 0.210 Glass 1.517 64.2 — 19 Plano 0.190 20Image Plano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 4 Aspheric Coefficients Surface # 1 2 4 5 6 7 k = 1.4673E−01−1.5015E+01 −2.6270E+01 −1.3602E+01 −4.0052E+01 9.0000E+01 A4 =5.0324E−03 −1.3146E−01 −1.5925E−01 1.3340E−01 −1.2275E−02 4.4223E−03 A6= −2.1430E−02 3.6545E−01 4.0232E−01 −2.2625E−01 −7.4975E−03 −2.1088E−02A8 = 5.2679E−02 −4.9019E−01 −5.1523E−01 4.7697E−01 2.4265E−02−4.9957E−03 A10 = −6.5303E−02 3.7771E−01 3.7522E−01 −5.4666E−01−3.8760E−02 −1.3338E−02 A12 = 4.4160E−02 −1.5424E−01 −1.5538E−013.2165E−01 2.6371E−02 — A14 = −1.1692E−02 2.4061E−02 2.6069E−02−6.9342E−02 −2.3186E−03 — Surface # 8 9 10 11 12 13 k = 7.1376E+018.2162E+01 6.1940E+01 7.3976E+01 9.4068E−01 −1.2659E+01 A4 = −2.5943E−02−3.5396E−02 −5.7194E−02 −1.4323E−01 −4.4477E−02 −1.7166E−01 A6 =1.3875E−03 −3.0765E−02 −3.9764E−02 1.1687E−01 2.4144E−01 2.5838E−01 A8 =−1.0133E−02 1.3015E−03 −2.2952E−02 −1.0712E−01 −4.2349E−01 −3.0376E−01A10 = −6.8767E−04 −4.4100E−03 4.2506E−03 −1.1602E−01 4.0156E−012.1792E−01 A12 = — 1.8038E−04 −5.3802E−05 3.1081E−01 −1.7210E−01−8.0391E−02 A14 = — — — −2.0572E−01 2.4497E−02 1.1738E−02 A16 = — — —4.5165E−02 — — Surface # 14 15 16 17 k = −4.5933E+01 −8.3161E+011.3558E+01 −3.2789E+00 A4 = −2.9810E−02 4.6801E−03 −3.4564E−01−2.4764E−01 A6 = 3.9769E−02 1.2493E−02 1.8932E−01 1.6278E−01 A8 =−8.6250E−02 −2.6607E−02 −5.8752E−02 −7.5303E−02 A10 = 5.3110E−021.1105E−02 1.3508E−02 2.2754E−02 A12 = −1.7548E−02 −1.7322E−03−2.2726E−03 −4.1792E−03 A14 = 2.4697E−03 8.5269E−05 2.3129E−044.1491E−04 A16 = — — −1.0258E−05 −1.6943E−05

In the 2nd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 2nd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 3 and Table 4 asthe following values and satisfy the following conditions:

2nd Embodiment f [mm] 3.77 (ΣAT + BL)/ΣCT 0.57 Fno 1.95 TL/ImgH 1.65HFOV [deg.] 36.7 TL [mm] 4.78 Nmax 1.660 Yc7/f(object-side surface 271)0.23 (V2 + V6)/V1 0.73 Yc7/f(image-side surface 272) — (R11 − R12)/−0.06 Yc82/f 0.29 (R11 + R12) (R15 − R16)/ 0.78 f/fG1 0.70 (R15 + R16)f/R16 2.71 f/fG2 0.41 f/f1 1.10 f/fG3 −0.44 f1/f2 −0.51 f/f7 0.74Y11/Y82 0.47 f/f8 −1.26 SD/TD 0.82 CT3/CT4 1.70 ATmax/ImgH 0.11 CT7/CT82.11 f/EPD 1.95 T23/T56 1.51 BL/EPD 0.39 T23/T78 0.76 TL/EPD 2.47

3rd Embodiment

FIG. 5 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure. FIG. 6 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 3rdembodiment. In FIG. 5, the image capturing unit includes thephotographing optical lens assembly (its reference numeral is omitted)of the present disclosure and an image sensor 397. The photographingoptical lens assembly includes, in order from an object side to an imageside, an aperture stop 300, a first lens element 310, a second lenselement 320, a third lens element 330, a fourth lens element 340, afifth lens element 350, a sixth lens element 360, a seventh lens element370, an eighth lens element 380, an IR-cut filter 390 and an imagesurface 395. A first lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the first lens element 310and the second lens element 320. A second lens group (reference numeralis omitted) of the photographing optical lens assembly includes thethird lens element 330, fourth lens element 340 and the fifth lenselement 350. A third lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the sixth lens element 360,the seventh lens element 370 and the eighth lens element 380. The imagesensor 397 is disposed on or near the image surface 395 of thephotographing optical lens assembly, and the photographing optical lensassembly has a total of eight lens elements (310-380). There is an airgap in a paraxial region between every two lens elements of the thirdlens group that are adjacent to each other. In this embodiment, thefirst lens group has positive refractive power, the second lens grouphas positive refractive power, and the third lens group has negativerefractive power.

The first lens element 310 with positive refractive power has anobject-side surface 311 being convex in a paraxial region thereof and animage-side surface 312 being concave in a paraxial region thereof. Thefirst lens element 310 is made of plastic material and has theobject-side surface 311 and the image-side surface 312 being bothaspheric.

The second lens element 320 with negative refractive power has anobject-side surface 321 being convex in a paraxial region thereof and animage-side surface 322 being concave in a paraxial region thereof. Thesecond lens element 320 is made of plastic material and has theobject-side surface 321 and the image-side surface 322 being bothaspheric.

The third lens element 330 with positive refractive power has anobject-side surface 331 being convex in a paraxial region thereof and animage-side surface 332 being convex in a paraxial region thereof. Thethird lens element 330 is made of plastic material and has theobject-side surface 331 and the image-side surface 332 being bothaspheric.

The fourth lens element 340 with negative refractive power has anobject-side surface 341 being concave in a paraxial region thereof andan image-side surface 342 being concave in a paraxial region thereof.The fourth lens element 340 is made of plastic material and has theobject-side surface 341 and the image-side surface 342 being bothaspheric.

The fifth lens element 350 with positive refractive power has anobject-side surface 351 being convex in a paraxial region thereof and animage-side surface 352 being convex in a paraxial region thereof. Thefifth lens element 350 is made of plastic material and has theobject-side surface 351 and the image-side surface 352 being bothaspheric.

The sixth lens element 360 with negative refractive power has anobject-side surface 361 being concave in a paraxial region thereof andan image-side surface 362 being convex in a paraxial region thereof. Thesixth lens element 360 is made of plastic material and has theobject-side surface 361 and the image-side surface 362 being bothaspheric.

The seventh lens element 370 with negative refractive power has anobject-side surface 371 being convex in a paraxial region thereof and animage-side surface 372 being concave in a paraxial region thereof. Theseventh lens element 370 is made of plastic material and has theobject-side surface 371 and the image-side surface 372 being bothaspheric.

The eighth lens element 380 with positive refractive power has anobject-side surface 381 being convex in a paraxial region thereof and animage-side surface 382 being concave in a paraxial region thereof. Theeighth lens element 380 is made of plastic material and has theobject-side surface 381 and the image-side surface 382 being bothaspheric. The image-side surface 382 of the eighth lens element 380 hasat least one inflection point.

The IR-cut filter 390 is made of glass and located between the eighthlens element 380 and the image surface 395, and will not affect thefocal length of the photographing optical lens assembly.

The detailed optical data of the 3rd embodiment are shown in Table 5 andthe aspheric surface data are shown in Table 6 below.

TABLE 5 3rd Embodiment f = 3.97 mm, Fno = 1.75, HFOV = 35.2 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.415 2 Lens 1 1.766 (ASP)0.650 Plastic 1.544 55.9 3.45 3 25.751 (ASP) 0.082 4 Lens 2 2.600 (ASP)0.220 Plastic 1.639 23.5 −5.97 5 1.495 (ASP) 0.297 6 Lens 3 5.377 (ASP)0.366 Plastic 1.544 55.9 7.25 7 −14.478 (ASP) 0.037 8 Lens 4 −11.768(ASP) 0.147 Plastic 1.544 55.9 −8.92 9 8.291 (ASP) 0.087 10 Lens 5 9.624(ASP) 0.354 Plastic 1.544 55.9 9.50 11 −11.034 (ASP) 0.236 12 Lens 6−2.044 (ASP) 0.268 Plastic 1.639 23.5 −9.71 13 −3.204 (ASP) 0.035 14Lens 7 2.047 (ASP) 0.419 Plastic 1.544 55.9 −122.49 15 1.843 (ASP) 0.24316 Lens 8 1.346 (ASP) 0.587 Plastic 1.544 55.9 26.64 17 1.256 (ASP)0.500 18 IR-cut filter Plano 0.210 Glass 1.517 64.2 — 19 Plano 0.243 20Image Plano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 6 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = 1.7606E−01−5.0000E+01 −3.5839E+01 −1.3306E+01 −2.4164E+01 9.0000E+01 A4 =3.3883E−03 −1.3351E−01 −1.7221E−01 1.1742E−01 −1.5095E−02 −1.6332E−02 A6= −2.1413E−02 3.6480E−01 4.0332E−01 −2.3781E−01 −1.2905E−02 −3.5827E−04A8 = 5.2368E−02 −4.9306E−01 −5.1231E−01 4.8887E−01 2.8967E−02 — A10 =−6.5934E−02 3.7906E−01 3.8118E−01 −5.5380E−01 −5.0574E−02 — A12 =4.3209E−02 −1.5437E−01 −1.5562E−01 3.2179E−01 2.6550E−02 — A14 =−1.1704E−02 2.4065E−02 2.6062E−02 −6.9334E−02 −2.2918E−03 — Surface # 89 10 11 12 13 k = 2.7907E+01 3.1895E+01 −9.0000E+01 6.9188E+011.2718E+00 −9.9934E+00 A4 = −2.6896E−03 −1.1708E−02 −3.1201E−02−1.1150E−01 −3.6883E−02 −1.8828E−01 A6 = −7.7490E−03 −2.6165E−02−2.5688E−02 1.1406E−01 2.4728E−01 2.6313E−01 A8 = — −6.2458E−03−1.9250E−02 −1.0573E−01 −4.2313E−01 −3.0195E−01 A10 = — −8.8311E−038.8072E−03 −1.1698E−01 4.0336E−01 2.1802E−01 A12 = — 1.4562E−049.6476E−07 3.0921E−01 −1.7202E−01 −8.0454E−02 A14 = — — — −2.0573E−012.4455E−02 1.1693E−02 A16 = — — — 4.5154E−02 — — Surface # 14 15 16 17 k= −1.0051E+01 −1.4423E+01 −2.7322E+00 −1.7788E+00 A4 = −4.1773E−02−1.8604E−02 −3.8002E−01 −2.8376E−01 A6 = 3.1988E−02 1.2534E−021.9090E−01 1.6714E−01 A8 = −8.2642E−02 −2.6769E−02 −5.8388E−02−7.5232E−02 A10 = 5.1053E−02 1.1185E−02 1.3534E−02 2.2738E−02 A12 =−1.8106E−02 −1.7156E−03 −2.2724E−03 −4.1790E−03 A14 = 2.9196E−038.4354E−05 2.3092E−04 4.1504E−04 A16 = — — −1.0325E−05 −1.6969E−05

In the 3rd embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 3rd embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 5 and Table 6 asthe following values and satisfy the following conditions:

3rd Embodiment f [mm] 3.97 (ΣAT + BL)/ΣCT 0.65 Fno 1.75 TL/ImgH 1.72HFOV [deg.] 35.2 TL [mm] 4.98 Nmax 1.639 Yc7/f(object-side surface 371)0.24 (V2 + V6)/V1 0.84 Yc7/f(image-side surface 372) 0.29 (R11 − R12)/−0.22 Yc82/f 0.29 (R11 + R12) (R15 − R16)/ 0.03 f/fG1 0.65 (R15 + R16)f/R16 3.16 f/fG2 0.52 f/f1 1.15 f/fG3 −0.40 f1/f2 −0.58 f/f7 −0.03Y11/Y82 0.48 f/f8 0.15 SD/TD 0.90 CT3/CT4 2.49 ATmax/ImgH 0.10 CT7/CT80.71 f/EPD 1.75 T23/T56 1.26 BL/EPD 0.42 T23/T78 1.22 TL/EPD 2.20

4th Embodiment

FIG. 7 is a schematic view of an image capturing unit according to the4th embodiment of the present disclosure. FIG. 8 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 4thembodiment. In FIG. 7, the image capturing unit includes thephotographing optical lens assembly (its reference numeral is omitted)of the present disclosure and an image sensor 497. The photographingoptical lens assembly includes, in order from an object side to an imageside, an aperture stop 400, a first lens element 410, a second lenselement 420, a third lens element 430, a fourth lens element 440, afifth lens element 450, a sixth lens element 460, a seventh lens element470, an eighth lens element 480, an IR-cut filter 490 and an imagesurface 495. A first lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the first lens element 410and the second lens element 420. A second lens group (reference numeralis omitted) of the photographing optical lens assembly includes thethird lens element 430, fourth lens element 440 and the fifth lenselement 450. A third lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the sixth lens element 460,the seventh lens element 470 and the eighth lens element 480. The imagesensor 497 is disposed on or near the image surface 495 of thephotographing optical lens assembly, and the photographing optical lensassembly has a total of eight lens elements (410-480). There is an airgap in a paraxial region between every two lens elements of the thirdlens group that are adjacent to each other. In this embodiment, thefirst lens group has positive refractive power, the second lens grouphas negative refractive power, and the third lens group has negativerefractive power.

The first lens element 410 with positive refractive power has anobject-side surface 411 being convex in a paraxial region thereof and animage-side surface 412 being concave in a paraxial region thereof. Thefirst lens element 410 is made of plastic material and has theobject-side surface 411 and the image-side surface 412 being bothaspheric.

The second lens element 420 with positive refractive power has anobject-side surface 421 being convex in a paraxial region thereof and animage-side surface 422 being convex in a paraxial region thereof. Thesecond lens element 420 is made of plastic material and has theobject-side surface 421 and the image-side surface 422 being bothaspheric.

The third lens element 430 with negative refractive power has anobject-side surface 431 being convex in a paraxial region thereof and animage-side surface 432 being concave in a paraxial region thereof. Thethird lens element 430 is made of plastic material and has theobject-side surface 431 and the image-side surface 432 being bothaspheric.

The fourth lens element 440 with positive refractive power has anobject-side surface 441 being convex in a paraxial region thereof and animage-side surface 442 being concave in a paraxial region thereof. Thefourth lens element 440 is made of plastic material and has theobject-side surface 441 and the image-side surface 442 being bothaspheric.

The fifth lens element 450 with positive refractive power has anobject-side surface 451 being convex in a paraxial region thereof and animage-side surface 452 being convex in a paraxial region thereof. Thefifth lens element 450 is made of plastic material and has theobject-side surface 451 and the image-side surface 452 being bothaspheric.

The sixth lens element 460 with negative refractive power has anobject-side surface 461 being concave in a paraxial region thereof andan image-side surface 462 being convex in a paraxial region thereof. Thesixth lens element 460 is made of plastic material and has theobject-side surface 461 and the image-side surface 462 being bothaspheric.

The seventh lens element 470 with positive refractive power has anobject-side surface 471 being convex in a paraxial region thereof and animage-side surface 472 being concave in a paraxial region thereof. Theseventh lens element 470 is made of plastic material and has theobject-side surface 471 and the image-side surface 472 being bothaspheric.

The eighth lens element 480 with negative refractive power has anobject-side surface 481 being convex in a paraxial region thereof and animage-side surface 482 being concave in a paraxial region thereof. Theeighth lens element 480 is made of plastic material and has theobject-side surface 481 and the image-side surface 482 being bothaspheric. The image-side surface 482 of the eighth lens element 480 hasat least one inflection point.

The IR-cut filter 490 is made of glass and located between the eighthlens element 480 and the image surface 495, and will not affect thefocal length of the photographing optical lens assembly.

The detailed optical data of the 4th embodiment are shown in Table 7 andthe aspheric surface data are shown in Table 8 below.

TABLE 7 4th Embodiment f = 5.98 mm, Fno = 1.75, HFOV = 33.2 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.631 2 Lens 1 2.663 (ASP)0.847 Plastic 1.544 55.9 7.05 3 7.722 (ASP) 0.070 4 Lens 2 8.190 (ASP)0.320 Plastic 1.544 55.9 14.48 5 −203.717 (ASP) 0.040 6 Lens 3 3.272(ASP) 0.305 Plastic 1.639 23.5 −7.19 7 1.841 (ASP) 0.386 8 Lens 4 6.833(ASP) 0.856 Plastic 1.544 55.9 22.31 9 14.941 (ASP) 0.071 10 Lens 518.422 (ASP) 0.557 Plastic 1.544 55.9 16.48 11 −17.286 (ASP) 0.347 12Lens 6 −2.939 (ASP) 0.408 Plastic 1.639 23.5 −20.77 13 −3.980 (ASP)0.038 14 Lens 7 3.405 (ASP) 0.666 Plastic 1.544 55.9 23.22 15 4.339(ASP) 0.441 16 Lens 8 3.413 (ASP) 0.820 Plastic 1.544 55.9 −13.61 172.139 (ASP) 0.550 18 IR-cut filter Plano 0.444 Glass 1.517 64.2 — 19Plano 0.328 20 Image Plano — Note: Reference wavelength is 587.6 nm(d-line).

TABLE 8 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = 1.6741E−01−4.8781E+01 −8.5057E+01 9.0000E+01 −3.2961E+01 −1.2325E+01 A4 =−1.9329E−03 −4.0980E−02 −1.0379E−03 3.4487E−03 −5.3092E−02 3.6654E−02 A6= −1.3476E−03 5.0523E−02 1.4686E−04 4.8289E−05 5.8196E−02 −3.2300E−02 A8= 3.2383E−03 −3.1314E−02 — — −3.3237E−02 3.1945E−02 A10 = −2.0079E−031.1208E−02 — — 1.1053E−02 −1.6716E−02 A12 = 6.0645E−04 −2.1005E−03 — —−2.1180E−03 4.3287E−03 A14 = −7.1566E−05 1.4723E−04 — — 1.5942E−04−4.2417E−04 Surface # 8 9 10 11 12 13 k = −3.4895E+01 5.7255E+019.0000E+01 −2.0818E+01 6.8347E−01 −4.7778E+00 A4 = −1.3773E−03−2.0577E−04 −4.7486E−03 −3.5896E−02 −1.2917E−02 −5.1986E−02 A6 =−9.3182E−05 −2.6911E−03 −3.0559E−03 1.7370E−02 3.5930E−02 3.7822E−02 A8= 1.9786E−03 −6.9743E−04 −7.5567E−04 −6.8386E−03 −2.7037E−02 −1.9337E−02A10 = −1.4877E−03 −2.1388E−04 3.8795E−05 −3.3883E−03 1.1765E−026.3981E−03 A12 = 3.8512E−04 5.0674E−06 1.3071E−05 4.1256E−03 −2.3058E−03−1.0824E−03 A14 = −1.4021E−05 — — −1.2572E−03 1.4753E−04 7.0003E−05 A16= — — — 1.2611E−04 — — Surface # 14 15 16 17 k = −1.3541E+01 −2.0305E+01−1.0756E+00 −1.4857E+00 A4 = −1.2789E−02 −3.2998E−03 −1.1664E−01−8.6893E−02 A6 = 5.0232E−03 1.4032E−03 2.6825E−02 2.3481E−02 A8 =−5.3472E−03 −1.6951E−03 −3.7535E−03 −4.8359E−03 A10 = 1.4749E−033.3299E−04 3.9729E−04 6.6760E−04 A12 = −2.4552E−04 −2.3050E−05−3.0447E−05 −5.5999E−05 A14 = 1.8979E−05 4.7206E−07 1.4118E−062.5393E−06 A16 = — — −2.9095E−08 −4.7365E−08

In the 4th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 4th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 7 and Table 8 asthe following values and satisfy the following conditions:

4th Embodiment f [mm] 5.98 (ΣAT + BL)/ΣCT 0.57 Fno 1.75 TL/ImgH 1.88HFOV [deg.] 33.2 TL [mm] 7.49 Nmax 1.639 Yc7/f(object-side surface 471)0.24 (V2 + V6)/V1 1.42 Yc7/f(image-side surface 472) 0.28 (R11 − R12)/−0.15 Yc82/f 0.28 (R11 + R12) (R15 − R16)/ 0.23 f/fG1 1.21 (R15 + R16)f/R16 2.79 f/fG2 −0.19 f/f1 0.85 f/fG3 −0.48 f1/f2 0.49 f/f7 0.26Y11/Y82 0.51 f/f8 −0.44 SD/TD 0.90 CT3/CT4 0.36 ATmax/ImgH 0.11 CT7/CT80.81 f/EPD 1.75 T23/T56 0.12 BL/EPD 0.39 T23/T78 0.09 TL/EPD 2.19

5th Embodiment

FIG. 9 is a schematic view of an image capturing unit according to the5th embodiment of the present disclosure. FIG. 10 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 5thembodiment. In FIG. 9, the image capturing unit includes thephotographing optical lens assembly (its reference numeral is omitted)of the present disclosure and an image sensor 597. The photographingoptical lens assembly includes, in order from an object side to an imageside, an aperture stop 500, a first lens element 510, a second lenselement 520, a third lens element 530, a fourth lens element 540, afifth lens element 550, a sixth lens element 560, a seventh lens element570, an eighth lens element 580, an IR-cut filter 590 and an imagesurface 595. A first lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the first lens element 510and the second lens element 520. A second lens group (reference numeralis omitted) of the photographing optical lens assembly includes thethird lens element 530, fourth lens element 540 and the fifth lenselement 550. A third lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the sixth lens element 560,the seventh lens element 570 and the eighth lens element 580. The imagesensor 597 is disposed on or near the image surface 595 of thephotographing optical lens assembly, and the photographing optical lensassembly has a total of eight lens elements (510-580). There is an airgap in a paraxial region between every two lens elements of the thirdlens group that are adjacent to each other. In this embodiment, thefirst lens group has positive refractive power, the second lens grouphas positive refractive power, and the third lens group has negativerefractive power.

The first lens element 510 with positive refractive power has anobject-side surface 511 being convex in a paraxial region thereof and animage-side surface 512 being convex in a paraxial region thereof. Thefirst lens element 510 is made of plastic material and has theobject-side surface 511 and the image-side surface 512 being bothaspheric.

The second lens element 520 with negative refractive power has anobject-side surface 521 being concave in a paraxial region thereof andan image-side surface 522 being concave in a paraxial region thereof.The second lens element 520 is made of plastic material and has theobject-side surface 521 and the image-side surface 522 being bothaspheric.

The third lens element 530 with negative refractive power has anobject-side surface 531 being convex in a paraxial region thereof and animage-side surface 532 being concave in a paraxial region thereof. Thethird lens element 530 is made of plastic material and has theobject-side surface 531 and the image-side surface 532 being bothaspheric.

The fourth lens element 540 with positive refractive power has anobject-side surface 541 being convex in a paraxial region thereof and animage-side surface 542 being concave in a paraxial region thereof. Thefourth lens element 540 is made of plastic material and has theobject-side surface 541 and the image-side surface 542 being bothaspheric.

The fifth lens element 550 with positive refractive power has anobject-side surface 551 being convex in a paraxial region thereof and animage-side surface 552 being convex in a paraxial region thereof. Thefifth lens element 550 is made of plastic material and has theobject-side surface 551 and the image-side surface 552 being bothaspheric.

The sixth lens element 560 with negative refractive power has anobject-side surface 561 being concave in a paraxial region thereof andan image-side surface 562 being convex in a paraxial region thereof. Thesixth lens element 560 is made of plastic material and has theobject-side surface 561 and the image-side surface 562 being bothaspheric.

The seventh lens element 570 with positive refractive power has anobject-side surface 571 being convex in a paraxial region thereof and animage-side surface 572 being concave in a paraxial region thereof. Theseventh lens element 570 is made of plastic material and has theobject-side surface 571 and the image-side surface 572 being bothaspheric.

The eighth lens element 580 with negative refractive power has anobject-side surface 581 being convex in a paraxial region thereof and animage-side surface 582 being concave in a paraxial region thereof. Theeighth lens element 580 is made of plastic material and has theobject-side surface 581 and the image-side surface 582 being bothaspheric. The image-side surface 582 of the eighth lens element 580 hasat least one inflection point.

The IR-cut filter 590 is made of glass and located between the eighthlens element 580 and the image surface 595, and will not affect thefocal length of the photographing optical lens assembly.

The detailed optical data of the 5th embodiment are shown in Table 9 andthe aspheric surface data are shown in Table 10 below.

TABLE 9 5th Embodiment f = 5.99 mm, Fno = 1.90, HFOV = 32.9 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.555 2 Lens 1 2.545 (ASP)0.842 Plastic 1.544 56.0 4.49 3 −54.860 (ASP) 0.070 4 Lens 2 −18.590(ASP) 0.320 Plastic 1.660 20.4 −15.55 5 23.058 (ASP) 0.040 6 Lens 33.822 (ASP) 0.440 Plastic 1..544 56.0 −10.89 7 2.229 (ASP) 0.337 8 Lens4 6.590 (ASP) 0.327 Plastic 1.544 56.0 21.36 9 14.959 (ASP) 0.238 10Lens 5 16.790 (ASP) 0.921 Plastic 1.544 56.0 15.72 11 −17.105 (ASP)0.209 12 Lens 6 −3.066 (ASP) 0.382 Plastic 1.639 23.5 −10.42 13 −5.964(ASP) 0.060 14 Lens 7 3.078 (ASP) 0.777 Plastic 1.544 56.0 12.28 155.198 (ASP) 0.508 16 Lend 8 3.638 (ASP) 0.816 Plastic 1.544 56.0 −12.1417 2.160 (ASP) 0.550 18 IR-cut filter Plano 0.444 Glass 1.517 64.2 — 19Plano 0.227 20 Image Plano — Note: Reference wavelength is 587.6 nm(d-line).

TABLE 10 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = 1.3417E−01−5.0000E+01 6.4988E+01 9.0000E+01 −2.8049E+01 −1.4840E+01 A4 =−2.3913E−03 −4.2464E−02 1.0247E−03 1.9540E−03 −5.2969E−02 3.5248E−02 A6= −5.9949E−04 4.9219E−02 1.4687E−03 −5.1517E−04 5.7058E−02 −3.0358E−02A8 = 2.9770E−03 −3.0580E−02 — — −3.3520E−02 3.2003E−02 A10 = −1.9813E−031.1256E−02 — — 1.0955E−02 −1.6646E−02 A12 = 6.3177E−04 −2.1419E−03 — —−2.1251E−03 4.3259E−03 A14 = −7.6558E−05 1.4780E−04 — — 1.5469E−04−4.2416E−04 Surface # 8 9 10 11 12 13 k = −5.5050E+01 5.4815E+018.7639E+01 7.2017E+01 8.6604E−01 −7.4985E+00 A4 = −2.0686E−03 2.2466E−032.7031E−06 −4.0840E−02 −1.3755E−02 −4.8404E−02 A6 = −4.1153E−04−2.4465E−03 −2.4518E−03 1.7784E−02 3.4786E−02 3.8267E−02 A8 = 2.1133E−03−7.1953E−04 −8.3588E−04 −7.0686E−03 −2.7068E−02 −1.9361E−02 A10 =−1.3173E−03 −2.0128E−04 −1.7997E−05 −3.5305E−03 1.1810E−02 6.3873E−03A12 = 3.9302E−04 5.8034E−05 −4.1862E−05 4.0983E−03 −2.3031E−03−1.0822E−03 A14 = −1.7043E−05 — — −1.2569E−03 1.4272E−04 7.0849E−05 A16= — — — 1.2661E−04 — — Surface # 14 15 16 17 k = −1.4423E+01 −4.1659E+01−9.6976E−01 −1.1592E+00 A4 = −1.3553E−02 −3.4495E−03 −1.1615E−01−8.8977E−02 A6 = 4.9109E−03 1.3387E−03 2.6785E−02 2.3550E−02 A8 =−5.3404E−03 −1.7104E−03 −3.7550E−03 −4.8319E−03 A10 = 1.4639E−033.3214E−04 3.9737E−04 6.6770E−04 A12 = −2.3980E−04 −2.3059E−05−3.0443E−05 −5.5974E−05 A14 = 1.9746E−05 4.7762E−07 1.4139E−062.5390E−06 A16 = — — −2.8805E−08 −4.7469E−08

In the 5th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 5th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 9 and Table 10as the following values and satisfy the following conditions:

5th Embodiment f [mm] 5.99 (ΣAT + BL)/ΣCT 0.56 Fno 1.90 TL/ImgH 1.88HFOV [deg.] 32.9 TL [mm] 7.51 Nmax 1.660 Yc7/f(object-side surface 571)0.23 (V2 + V6)/V1 0.78 Yc7/f(image-side surface 572) 0.26 (R11 − R12)/−0.32 Yc82/f 0.26 (R11 + R12) (R15 − R16)/ 0.25 f/fG1 1.01 (R15 + R16)f/R16 2.77 f/fG2 0.11 f/f1 1.33 f/fG3 −0.61 f1/f2 −0.29 f/f7 0.49Y11/Y82 0.46 f/f8 −0.49 SD/TD 0.91 CT3/CT4 1.35 ATmax/ImgH 0.13 CT7/CT80.95 f/EPD 1.90 T23/T56 0.19 BL/EPD 0.39 T23/T78 0.08 TL/EPD 2.38

6th Embodiment

FIG. 11 is a schematic view of an image capturing unit according to the6th embodiment of the present disclosure. FIG. 12 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 6thembodiment. In FIG. 11, the image capturing unit includes thephotographing optical lens assembly (its reference numeral is omitted)of the present disclosure and an image sensor 690. The photographingoptical lens assembly includes, in order from an object side to an imageside, an aperture stop 600, a first lens element 610, a second lenselement 620, a third lens element 630, a fourth lens element 640, afifth lens element 650, a sixth lens element 660, a seventh lens element670, an eighth lens element 680, an IR-cut filter 690 and an imagesurface 695. A first lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the first lens element 610and the second lens element 620. A second lens group (reference numeralis omitted) of the photographing optical lens assembly includes thethird lens element 630, fourth lens element 640 and the fifth lenselement 650. A third lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the sixth lens element 660,the seventh lens element 670 and the eighth lens element 680. The imagesensor 697 is disposed on or near the image surface 695 of thephotographing optical lens assembly, and the photographing optical lensassembly has a total of eight lens elements (610-680). There is an airgap in a paraxial region between every two lens elements of the thirdlens group that are adjacent to each other. In this embodiment, thefirst lens group has positive refractive power, the second lens grouphas positive refractive power, and the third lens group has negativerefractive power.

The first lens element 610 with positive refractive power has anobject-side surface 611 being convex in a paraxial region thereof and animage-side surface 612 being concave in a paraxial region thereof. Thesixth lens element 610 is made of plastic material and has theobject-side surface 611 and the image-side surface 612 being bothaspheric.

The second lens element 620 with negative refractive power has anobject-side surface 621 being convex in a paraxial region thereof and animage-side surface 622 being concave in a paraxial region thereof. Thesecond lens element 620 is made of plastic material and has theobject-side surface 621 and the image-side surface 622 being bothaspheric.

The third lens element 630 with positive refractive power has anobject-side surface 631 being convex in a paraxial region thereof and animage-side surface 632 being convex in a paraxial region thereof. Thethird lens element 630 is made of plastic material and has theobject-side surface 631 and the image-side surface 632 being bothaspheric.

The fourth lens element 640 with negative refractive power has anobject-side surface 641 being concave in a paraxial region thereof andan image-side surface 642 being concave in a paraxial region thereof.The fourth lens element 640 is made of plastic material and has theobject-side surface 641 and the image-side surface 642 being bothaspheric.

The fifth lens element 650 with positive refractive power has anobject-side surface 651 being convex in a paraxial region thereof and animage-side surface 652 being convex in a paraxial region thereof. Thefifth lens element 650 is made of plastic material and has theobject-side surface 651 and the image-side surface 652 being bothaspheric.

The sixth lens element 660 with positive refractive power has anobject-side surface 661 being concave in a paraxial region thereof andan image-side surface 662 being convex in a paraxial region thereof. Thesixth lens element 660 is made of plastic material and has theobject-side surface 661 and the image-side surface 662 being bothaspheric.

The seventh lens element 670 with negative refractive power has anobject-side surface 671 being concave in a paraxial region thereof andan image-side surface 672 being concave in a paraxial region thereof.The seventh lens element 670 is made of plastic material and has theobject-side surface 671 and the image-side surface 672 being bothaspheric.

The eighth lens element 680 with negative refractive power has anobject-side surface 681 being convex in a paraxial region thereof and animage-side surface 682 being concave in a paraxial region thereof. Theeighth lens element 680 is made of plastic material and has theobject-side surface 681 and the image-side surface 682 being bothaspheric. The image-side surface 682 of the eighth lens element 680 hasat least one inflection point.

The IR-cut filter 690 is made of glass and located between the eighthlens element 680 and the image surface 695, and will not affect thefocal length of the photographing optical lens assembly.

The detailed optical data of the 6th embodiment are shown in Table 11and the aspheric surface data are shown in Table 12 below.

TABLE 11 6th Embodiment f = 4.37 mm, Fno = 1.95, HFOV = 32.7 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.401 2 Lens 1 1.705 (ASP)0.692 Plastic 1.544 55.9 3.30 3 28.524 (ASP) 0.070 4 Lens 2 2.874 (ASP)0.230 Plastic 1.639 23.5 −5.68 5 1.554 (ASP) 0.250 6 Lens 3 5.721 (ASP)0.459 Plastic 1.544 55.9 3.30 7 −11.214 (ASP) 0.053 8 Lens 4 −9.262(ASP) 0.151 Plastic 1.544 55.9 −13.95 9 42.304 (ASP) 0.205 10 Lens 562.900 (ASP) 0.443 Plastic 1.544 55.9 17.07 11 −10.872 (ASP) 0.134 12Lens 6 −2.665 (ASP) 0.314 Plastic 1.639 23.5 142.31 13 −2.708 (ASP)0.121 14 Lens 7 −30.102 (ASP) 0.454 Plastic 1.544 55.9 −17.47 15 13.962(ASP) 0.126 16 Lend 8 2.066 (ASP) 0.514 Plastic 1.544 55.9 −9.88 171.361 (ASP) 0.450 18 IR-cut filter Plano 0.210 Glass 1.517 64.2 — 19Plano 0.301 20 Image Plano — Note: Reference wavelength is 587.6 nm(d-line).

TABLE 12 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = 2.1674E−01−4.9516E+01 −3.7522E+01 −1.3303E+01 −1.9999E+01 8.5093E+01 A4 =1.3946E−03 −1.3323E−01 −1.7545E−01 1.2855E−01 −6.3965E−03 −9.5283E−03 A6= −2.0598E−02 3.6306E−01 4.0584E−01 −2.3141E−01 −1.9316E−03 −6.5486E−03A8 = 5.0644E−02 −4.9238E−01 −5.1185E−01 4.8795E−01 3.4843E−02 3.3721E−03A10 = −6.7715E−02 3.8057E−01 3.7933E−01 −5.4822E−01 −4.2147E−02 — A12 =4.5003E−02 −1.5437E−01 −1.5563E−01 3.2179E−01 2.6549E−02 — A14 =−1.1705E−02 2.4066E−02 2.6062E−02 −6.9334E−02 −2.2918E−03 — Surface # 89 10 11 12 13 k = 2.7144E+01 8.9677E+01 −8.7044E+01 6.5604E+011.6291E+00 −1.2743E+01 A4 = −3.1962E−03 −1.8814E−02 −7.0542E−02−9.3010E−02 −8.9983E−02 −1.6441E−01 A6 = −3.3006E−03 −2.4056E−02−3.4329E−02 9.2570E−02 2.6421E−01 2.5430E−01 A8 = −7.9705E−03−1.9487E−03 −2.8803E−02 −1.0356E−01 −4.2611E−01 −3.0319E−01 A10 = —−8.1491E−03 4.8180E−03 −1.1588E−01 3.9726E−01 2.1822E−01 A12 = —1.4562E−04 8.8153E−07 3.0818E−01 −1.7202E−01 −8.0505E−02 A14 = — — —−2.0573E−01 2.4455E−02 1.1567E−02 A16 = — — — 4.5154E−02 — — Surface #14 15 16 17 k = −9.0000E+01 −8.9993E+01 −9.0284E−01 −2.0562E+00 A4 =2.7669E−02 −1.4887E−02 −3.7958E−01 −2.7011E−01 A6 = −2.0492E−021.4428E−02 1.8820E−01 1.6545E−01 A8 = −7.0510E−02 −2.6799E−02−5.8286E−02 −7.5297E−02 A10 = 5.2817E−02 1.1156E−02 1.3553E−022.2762E−02 A12 = −1.8630E−02 −1.7202E−03 −2.2705E−03 −4.1759E−03 A14 =2.8558E−03 8.3097E−05 2.3095E−04 4.1513E−04 A16 = — — −1.0359E−05−1.7022E−05

In the 6th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 6th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 11 and Table 12as the following values and satisfy the following conditions:

6th Embodiment f [mm] 4.37 (ΣAT + BL)/ΣCT 0.59 Fno 1.95 TL/ImgH 1.79HFOV [deg.] 32.7 TL [mm] 5.18 Nmax 1.639 Yc7/f(object-side surface 671)— (V2 + V6)/V1 0.84 Yc7/f(image-side surface 672) 0.20 (R11 − R12)/−0.01 Yc82/f 0.26 (R11 + R12) (R15 − R16)/ 0.21 f/fG1 0.76 (R15 + R16)f/R16 3.21 f/fG2 0.56 f/f1 1.32 f/fG3 −0.73 f1/f2 −0.58 f/f7 −0.25Y11/Y82 0.48 f/f8 −0.44 SD/TD 0.90 CT3/CT4 3.04 ATmax/ImgH 0.09 CT7/CT80.88 f/EPD 1.95 T23/T56 1.87 BL/EPD 0.43 T23/T78 1.98 TL/EPD 2.31

7th Embodiment

FIG. 13 is a schematic view of an image capturing unit according to the7th embodiment of the present disclosure. FIG. 14 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 7thembodiment. In FIG. 13, the image capturing unit includes thephotographing optical lens assembly (its reference numeral is omitted)of the present disclosure and an image sensor 797. The photographingoptical lens assembly includes, in order from an object side to an imageside, an aperture stop 700, a first lens element 710, a second lenselement 720, a third lens element 730, a fourth lens element 740, afifth lens element 750, a sixth lens element 760, a seventh lens element770, an eighth lens element 780, an IR-cut filter 790 and an imagesurface 795. A first lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the first lens element 710and the second lens element 720. A second lens group (reference numeralis omitted) of the photographing optical lens assembly includes thethird lens element 730, fourth lens element 740 and the fifth lenselement 750. A third lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the sixth lens element 760,the seventh lens element 770 and the eighth lens element 780. The imagesensor 797 is disposed on or near the image surface 795 of thephotographing optical lens assembly, and the photographing optical lensassembly has a total of eight lens elements (710-780). There is an airgap in a paraxial region between every two lens elements of the thirdlens group that are adjacent to each other. In this embodiment, thefirst lens group has positive refractive power, the second lens grouphas positive refractive power, and the third lens group has positiverefractive power.

The first lens element 710 with positive refractive power has anobject-side surface 711 being convex in a paraxial region thereof and animage-side surface 712 being concave in a paraxial region thereof. Thefirst lens element 710 is made of plastic material and has theobject-side surface 711 and the image-side surface 712 being bothaspheric.

The second lens element 720 with negative refractive power has anobject-side surface 721 being convex in a paraxial region thereof and animage-side surface 722 being concave in a paraxial region thereof. Thesecond lens element 720 is made of plastic material and has theobject-side surface 721 and the image-side surface 722 being bothaspheric.

The third lens element 730 with positive refractive power has anobject-side surface 731 being convex in a paraxial region thereof and animage-side surface 732 being concave in a paraxial region thereof. Thethird lens element 730 is made of plastic material and has theobject-side surface 731 and the image-side surface 732 being bothaspheric.

The fourth lens element 740 with positive refractive power has anobject-side surface 741 being convex in a paraxial region thereof and animage-side surface 742 being convex in a paraxial region thereof. Thefourth lens element 740 is made of plastic material and has theobject-side surface 741 and the image-side surface 742 being bothaspheric.

The fifth lens element 750 with negative refractive power has anobject-side surface 751 being concave in a paraxial region thereof andan image-side surface 752 being convex in a paraxial region thereof. Thefifth lens element 750 is made of plastic material and has theobject-side surface 751 and the image-side surface 752 being bothaspheric.

The sixth lens element 760 with positive refractive power has anobject-side surface 761 being convex in a paraxial region thereof and animage-side surface 762 being convex in a paraxial region thereof. Thesixth lens element 760 is made of plastic material and has theobject-side surface 761 and the image-side surface 762 being bothaspheric.

The seventh lens element 770 with positive refractive power has anobject-side surface 771 being concave in a paraxial region thereof andan image-side surface 772 being convex in a paraxial region thereof. Theseventh lens element 770 is made of plastic material and has theobject-side surface 771 and the image-side surface 772 being bothaspheric.

The eighth lens element 780 with negative refractive power has anobject-side surface 781 being concave in a paraxial region thereof andan image-side surface 782 being concave in a paraxial region thereof.The eighth lens element 780 is made of plastic material and has theobject-side surface 781 and the image-side surface 782 being bothaspheric. The image-side surface 782 of the eighth lens element 780 hasat least one inflection point.

The IR-cut filter 790 is made of glass and located between the eighthlens element 780 and the image surface 795, and will not affect thefocal length of the photographing optical lens assembly.

The detailed optical data of the 7th embodiment are shown in Table 13and the aspheric surface data are shown in Table 14 below.

TABLE 13 7th Embodiment f = 6.35 mm, Fno = 2.20, HFOV = 42.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.331 2 Lens 1 3.431 (ASP)0.718 Plastic 1.544 55.9 10.41 3 8.057 (ASP) 0.188 4 Lens 2 4.716 (ASP)0.396 Plastic 1.640 23.3 −21.74 5 3.406 (ASP) 0.355 6 Lens 3 8.194 (ASP)0.588 Plastic 1.544 55.9 20.96 7 28.361 (ASP) 0.263 8 Lens 4 12.385(ASP) 0.699 Plastic 1.544 55.9 14.42 9 −21.007 (ASP) 0.568 10 Lens 5−1.734 (ASP) 0.411 Plastic 1.640 23.3 −9.30 11 −2.674 (ASP) 0.072 12Lens 6 5.765 (ASP) 0.887 Plastic 1.544 55.9 8.22 13 −18.931 (ASP) 0.33614 Lens 7 −10.088 (ASP) 0.690 Plastic 1.544 55.9 4.56 15 −2.039 (ASP)0.362 16 Lend 8 −38.051 (ASP) 0.745 Plastic 1.530 55.8 −2.88 17 1.601(ASP) 1.050 18 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 19 Plano0.320 20 Image Plano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 14 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = 8.9915E−011.0446E+01 −9.7945E+00 −5.7630E+00 −3.4397E+00 −7.5106E+00 A4 =2.1862E−04 −1.3002E−02 −2.8750E−02 −1.4489E−02 −1.5964E−03 −8.1781E−03A6 = 9.3154E−04 8.4048E−03 1.2076E−02 6.3792E−03 −1.6598E−04 6.2768E−04A8 = 3.7742E−04 −1.7322E−03 −2.9274E−03 −1.2331E−03 −1.4227E−06−6.3861E−05 A10 = −4.6373E−04 3.2602E−06 7.4904E−05 1.3194E−04−6.5983E−05 −5.5516E−05 A12 = 2.4135E−04 8.1796E−05 1.0317E−04−6.1925E−05 — — A14 = −3.4857E−05 −4.1887E−06 −2.7815E−05 1.1831E−05 — —Surface # 8 9 10 11 12 13 k = −4.9161E+01 3.0000E+00 −2.1379E+00−3.9420E+00 1.0633E+00 2.9486E+00 A4 = −1.4353E−02 −9.4664E−033.4117E−02 1.1014E−02 −1.5491E−02 1.3464E−03 A6 = −1.1328E−03−2.5409E−03 −1.5949E−02 −5.0593E−03 2.7379E−03 −2.5908E−04 A8 =3.5833E−04 1.9952E−04 4.0038E−03 1.1742E−03 −3.7208E−04 −2.5237E−06 A10= −5.6257E−05 −2.1845E−06 −6.7402E−04 −1.7557E−04 1.5345E−05 −6.8350E−08A12 = −1.5438E−05 −9.3498E−07 8.7207E−05 1.9021E−05 5.3033E−07 — A14 =3.0947E−06 4.4233E−07 −5.6319E−06 −9.1764E−07 −8.4643E−08 — Surface # 1415 16 17 k = 2.6774E+00 −6.7965E+00 8.5000E+01 −6.5954E+00 A4 =−1.9919E−03 −4.8403E−03 −1.5278E−02 −6.6138E−03 A6 = 1.0979E−04−1.1705E−04 7.1418E−04 4.5320E−04 A8 = 1.8379E−06 3.8093E−04 −2.7403E−06−2.5975E−05 A10 = −1.6074E−07 −6.1316E−05 3.3653E−07 8.4289E−07 A12 = —3.7673E−06 8.0297E−09 −1.7531E−08 A14 = — −8.2877E−08 −1.6049E−091.8760E−10

In the 7th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 7th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 13 and Table 14as the following values and satisfy the following conditions:

7th Embodiment f [mm] 6.35 (ΣAT + BL)/ΣCT 0.74 Fno 2.20 TL/ImgH 1.49HFOV [deg.] 42.0 TL [mm] 8.95 Nmax 1.640 Yc7/f(object-side surface 771)— (V2 + V6)/V1 1.42 Yc7/f(image-side surface 772) — (R11 − R12)/ −1.88Yc82/f 0.49 (R11 + R12) (R15 − R16)/ 1.09 f/fG1 0.37 (R15 + R16) f/R163.97 f/fG2 0.09 f/f1 0.61 f/fG3 0.57 f1/f2 −0.48 f/f7 1.39 Y11/Y82 0.27f/f8 −2.20 SD/TD 0.95 CT3/CT4 0.84 ATmax/ImgH 0.09 CT7/CT8 0.93 f/EPD2.20 T23/T56 4.93 BL/EPD 0.58 T23/T78 0.98 TL/EPD 3.10

8th Embodiment

FIG. 15 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure. FIG. 16 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 8thembodiment. In FIG. 15, the image capturing unit includes thephotographing optical lens assembly (its reference numeral is omitted)of the present disclosure and an image sensor 897. The photographingoptical lens assembly includes, in order from an object side to an imageside, an aperture stop 800, a first lens element 810, a second lenselement 820, a third lens element 830, a fourth lens element 840, afifth lens element 850, a sixth lens element 860, a seventh lens element870, an eighth lens element 880, an IR-cut filter 890 and an imagesurface 895. A first lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the first lens element 810and the second lens element 820. A second lens group (reference numeralis omitted) of the photographing optical lens assembly includes thethird lens element 830, fourth lens element 840 and the fifth lenselement 850. A third lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the sixth lens element 860,the seventh lens element 870 and the eighth lens element 880. The imagesensor 897 is disposed on or near the image surface 895 of thephotographing optical lens assembly, and the photographing optical lensassembly has a total of eight lens elements (810-880). There is an airgap in a paraxial region between every two lens elements of the thirdlens group that are adjacent to each other. In this embodiment, thefirst lens group has positive refractive power, the second lens grouphas positive refractive power, and the third lens group has positiverefractive power.

The first lens element 810 with positive refractive power has anobject-side surface 811 being convex in a paraxial region thereof and animage-side surface 812 being concave in a paraxial region thereof. Thefirst lens element 810 is made of plastic material and has theobject-side surface 811 and the image-side surface 812 being bothaspheric.

The second lens element 320 with negative refractive power has anobject-side surface 821 being convex in a paraxial region thereof and animage-side surface 822 being concave in a paraxial region thereof. Thesecond lens element 820 is made of plastic material and has theobject-side surface 821 and the image-side surface 822 being bothaspheric.

The third lens element 830 with positive refractive power has anobject-side surface 831 being convex in a paraxial region thereof and animage-side surface 832 being concave in a paraxial region thereof. Thethird lens element 830 is made of plastic material and has theobject-side surface 831 and the image-side surface 832 being bothaspheric.

The fourth lens element 840 with positive refractive power has anobject-side surface 841 being convex in a paraxial region thereof and animage-side surface 842 being convex in a paraxial region thereof. Thefourth lens element 840 is made of plastic material and has theobject-side surface 841 and the image-side surface 842 being bothaspheric.

The fifth lens element 850 with negative refractive power has anobject-side surface 851 being concave in a paraxial region thereof andan image-side surface 852 being convex in a paraxial region thereof. Thefifth lens element 850 is made of plastic material and has theobject-side surface 851 and the image-side surface 852 being bothaspheric.

The sixth lens element 860 with positive refractive power has anobject-side surface 861 being convex in a paraxial region thereof and animage-side surface 862 being concave in a paraxial region thereof. Thesixth lens element 860 is made of plastic material and has theobject-side surface 861 and the image-side surface 862 being bothaspheric.

The seventh lens element 870 with positive refractive power has anobject-side surface 871 being convex in a paraxial region thereof and animage-side surface 872 being convex in a paraxial region thereof. Theseventh lens element 870 is made of plastic material and has theobject-side surface 871 and the image-side surface 872 being bothaspheric.

The eighth lens element 880 with negative refractive power has anobject-side surface 881 being concave in a paraxial region thereof andan image-side surface 882 being concave in a paraxial region thereof.The eighth lens element 880 is made of plastic material and has theobject-side surface 881 and the image-side surface 882 being bothaspheric. The image-side surface 882 of the eighth lens element 880 hasat least one inflection point.

The IR-cut filter 890 is made of glass and located between the eighthlens element 880 and the image surface 895, and will not affect thefocal length of the photographing optical lens assembly.

The detailed optical data of the 8th embodiment are shown in Table 15and the aspheric surface data are shown in Table 16 below.

TABLE 15 8th Embodiment f = 6.05 mm, Fno = 2.50, HFOV = 38.8 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.230 2 Lens 1 3.225 (ASP)0.789 Plastic 1.544 55.9 9.63 3 7.663 (ASP) 0.168 4 Lens 2 4.692 (ASP)0.346 Plastic 1.640 23.3 −18.10 5 3.243 (ASP) 0.314 6 Lens 3 5.692 (ASP)0.476 Plastic 1.544 55.9 19.25 7 12.098 (ASP) 0.460 8 Lens 4 14.559(ASP) 0.724 Plastic 1.544 55.9 9.46 9 −7.823 (ASP) 0.353 10 Lens 5−1.743 (ASP) 0.289 Plastic 1.640 23.3 −6.66 11 −3.140 (ASP) 0.226 12Lens 6 6.722 (ASP) 0.364 Plastic 1.640 23.3 20.62 13 13.416 (ASP) 0.10214 Lens 7 17.648 (ASP) 0.972 Plastic 1.544 55.9 3.40 15 −2.025 (ASP)0.432 16 Lens 8 −17.447 (ASP) 0.788 Plastic 1.530 55.8 −2.80 17 1.646(ASP) 1.050 18 IR-cut filter Plano 0.316 Glass 1.517 64.2 — 19 Plano0.251 20 Image Plano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 16 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = 9.7327E−011.3914E+01 −1.0179E+01 −5.7767E+00 −5.2840E+00 −1.2252E+01 A4 =2.7811E−04 −1.0851E−02 −2.8930E−02 −1.4065E−02 −1.9697E−03 −8.8286E−03A6 = 1.0603E−03 8.5807E−03 1.2086E−02 6.4812E−03 2.4629E−04 6.5023E−04A8 = 3.3103E−04 −1.7220E−03 −3.0661E−03 −1.2735E−03 1.5592E−04−1.3966E−04 A10 = −4.2729E−04 1.2047E−04 3.4757E−05 8.4359E−05−6.5196E−05 −6.0865E−05 A12 = 3.2854E−04 1.4342E−04 9.7425E−05−8.2394E−05 — — A14 = −6.0799E−05 2.8783E−05 2.3134E−06 1.6483E−05 — —Surface # 8 9 10 11 12 13 k = −2.6542E+01 −1.6034E+00 −2.1244E+00−4.7602E+00 2.1182E+00 −2.0000E+01 A4 = −1.4866E−02 −1.0663E−023.4762E−02 1.0584E−02 −1.4918E−02 −3.5137E−04 A6 = −1.5743E−03−2.4323E−03 −1.5850E−02 −5.1466E−03 2.5301E−03 −3.6027E−04 A8 =3.4251E−04 2.1082E−04 4.0076E−03 1.1666E−03 −3.8897E−04 −1.1243E−05 A10= −5.0557E−05 −1.1461E−06 −6.7647E−04 −1.7611E−04 1.7863E−05 −1.5867E−06A12 = −1.5725E−05 −2.9170E−08 8.5997E−05 1.9016E−05 6.7620E−07 — A14 =2.1634E−06 8.8760E−07 −6.0050E−06 −9.2073E−07 −1.2743E−07 — Surface # 1415 16 17 k = −2.0000E+01 −6.6776E+00 2.8072E+00 −6.8316E+00 A4 =−4.3273E−03 −2.2862E−03 −1.5713E−02 −6.8908E−03 A6 = 4.4821E−05−1.6718E−04 7.4870E−04 4.7037E−04 A8 = 5.3925E−07 3.7849E−04 −1.3310E−06−2.6480E−05 A10 = −1.2113E−07 −6.1384E−05 3.5705E−07 8.0096E−07 A12 = —3.7687E−06 4.1296E−09 −1.7720E−08 A14 = — −8.2605E−08 −1.9486E−092.6140E−10

In the 8th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 8th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 15 and Table 16as the following values and satisfy the following conditions:

8th Embodiment f [mm] 6.05 (ΣAT + BL)/ΣCT 0.77 Fno 2.50 TL/ImgH 1.65HFOV [deg.] 38.8 TL [mm] 8.42 Nmax 1.640 Yc7/f(object-side surface 871)0.29 (V2 + V6)/V1 0.83 Yc7/f(image-side surface 872) — (R11 − R12)/−0.33 Yc82/f 0.50 (R11 + R12) (R15 − R16)/ 1.21 f/fG1 0.35 (R15 + R16)f/R16 3.67 f/fG2 0.10 f/f1 0.63 f/fG3 0.61 f1/f2 −0.53 f/f7 1.78 Y11/Y820.28 f/f8 −2.16 SD/TD 0.97 CT3/CT4 0.66 ATmax/ImgH 0.09 CT7/CT8 1.23f/EPD 2.50 T23/T56 1.39 BL/EPD 0.67 T23/T78 0.73 TL/EPD 3.48

9th Embodiment

FIG. 17 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure. FIG. 18 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 9thembodiment. In FIG. 17, the image capturing unit includes thephotographing optical lens assembly (its reference numeral is omitted)of the present disclosure and an image sensor 997. The photographingoptical lens assembly includes, in order from an object side to an imageside, an aperture stop 900, a first lens element 910, a second lenselement 920, a third lens element 930, a fourth lens element 940, afifth lens element 950, a sixth lens element 960, a seventh lens element970, an eighth lens element 980, an IR-cut filter 990 and an imagesurface 995. A first lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the first lens element 910and the second lens element 920. A second lens group (reference numeralis omitted) of the photographing optical lens assembly includes thethird lens element 930, fourth lens element 940 and the fifth lenselement 950. A third lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the sixth lens element 960,the seventh lens element 970 and the eighth lens element 980. The imagesensor 997 is disposed on or near the image surface 995 of thephotographing optical lens assembly, and the photographing optical lensassembly has a total of eight lens elements (910-980). There is an airgap in a paraxial region between every two lens elements of the thirdlens group that are adjacent to each other. In this embodiment, thefirst lens group has positive refractive power, the second lens grouphas positive refractive power, and the third lens group has negativerefractive power.

The first lens element 910 with positive refractive power has anobject-side surface 911 being convex in a paraxial region thereof and animage-side surface 912 being concave in a paraxial region thereof. Thefirst lens element 910 is made of plastic material and has theobject-side surface 911 and the image-side surface 912 being bothaspheric.

The second lens element 920 with negative refractive power has anobject-side surface 921 being convex in a paraxial region thereof and animage-side surface 922 being concave in a paraxial region thereof. Thesecond lens element 920 is made of plastic material and has theobject-side surface 921 and the image-side surface 922 being bothaspheric.

The third lens element 930 with positive refractive power has anobject-side surface 931 being convex in a paraxial region thereof and animage-side surface 932 being convex in a paraxial region thereof. Thethird lens element 930 is made of plastic material and has theobject-side surface 931 and the image-side surface 932 being bothaspheric.

The fourth lens element 940 with negative refractive power has anobject-side surface 941 being concave in a paraxial region thereof andan image-side surface 942 being concave in a paraxial region thereof.The fourth lens element 940 is made of plastic material and has theobject-side surface 941 and the image-side surface 942 being bothaspheric.

The fifth lens element 950 with positive refractive power has anobject-side surface 951 being concave in a paraxial region thereof andan image-side surface 952 being convex in a paraxial region thereof. Thefifth lens element 950 is made of plastic material and has theobject-side surface 951 and the image-side surface 952 being bothaspheric.

The sixth lens element 960 with positive refractive power has anobject-side surface 961 being concave in a paraxial region thereof andan image-side surface 962 being convex in a paraxial region thereof. Thesixth lens element 960 is made of plastic material and has theobject-side surface 961 and the image-side surface 962 being bothaspheric.

The seventh lens element 970 with negative refractive power has anobject-side surface 971 being convex in a paraxial region thereof and animage-side surface 972 being concave in a paraxial region thereof. Thefifth lens element 970 is made of plastic material and has theobject-side surface 971 and the image-side surface 972 being bothaspheric.

The eighth lens element 980 with negative refractive power has anobject-side surface 981 being convex in a paraxial region thereof and animage-side surface 982 being concave in a paraxial region thereof. Theeighth lens element 980 is made of plastic material and has theobject-side surface 981 and the image-side surface 982 being bothaspheric. The image-side surface 982 of the eighth lens element 980 hasat least one inflection point.

The IR-cut filter 990 is made of glass and located between the eighthlens element 980 and the image surface 995, and will not affect thefocal length of the photographing optical lens assembly.

The detailed optical data of the 9th embodiment are shown in Table 17and the aspheric surface data are shown in Table 18 below.

TABLE 17 9th Embodiment f = 6.35 mm, Fno = 1.80, HFOV = 34.4 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.698 2 Lens 1 2.628 (ASP)0.912 Plastic 1.544 55.9 5.23 3 30.092 (ASP) 0.110 4 Lens 2 4.868 (ASP)0.408 Plastic 1.639 23.5 −9.27 5 2.584 (ASP) 0.432 6 Lens 3 9.165 (ASP)0.611 Plastic 1..544 55.9 11.09 7 −17.258 (ASP) 0.080 8 Lens 4 −14.763(ASP) 0.243 Plastic 1.544 55.9 −24.38 9 131.813 (ASP) 0.237 10 Lens 5−408.163 (ASP) 0.679 Plastic 1.544 55.9 31.63 11 −16.526 (ASP) 0.336 12Lens 6 −3.215 (ASP) 0.390 Plastic 1.639 23.5 75.00 13 −3.155 (ASP) 0.03514 Lens 7 4.465 (ASP) 0.623 Plastic 1.544 55.9 −34.61 15 3.432 (ASP)0.553 16 Lens 8 4.324 (ASP) 0.838 Plastic 1.544 55.9 −12.29 17 2.446(ASP) 0.600 18 IR-cut filter Plano 0.326 Glass 1.517 64.2 — 19 Plano0.282 20 Image Plano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 18 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = 1.8867E−01−5.0000E+01 −3.7126E+01 −1.4019E+01 −2.2856E+01 8.9705E+01 A4 =1.0690E−03 −3.7048E−02 −4.5877E−02 3.5651E−02 −3.9792E−03 −4.6341E−03 A6= −2.3224E−03 4.0543E−02 4.4753E−02 −2.5798E−02 −1.3863E−03 −8.5797E−04A8 = 2.3501E−03 −2.2626E−02 −2.3596E−02 2.2418E−02 1.5124E−03 — A10 =−1.2612E−03 7.2857E−03 7.3388E−03 −1.0521E−02 −8.6274E−04 — A12 =3.4896E−04 −1.2297E−03 −1.2243E−03 2.6180E−03 1.8949E−04 — A14 =−3.7428E−05 8.0213E−05 7.9397E−05 −2.3333E−04 −4.3104E−06 — Surface # 89 10 11 12 13 k = 3.9077E+01 −9.0000E+01 −9.0000E+01 6.5040E+011.3817E+00 −1.6373E+01 A4 = −2.2212E−03 −5.5460E−03 −1.7005E−02−3.3633E−02 −9.2720E−03 −4.8459E−02 A6 = −3.6569E−04 −4.4737E−03−4.7753E−03 1.2586E−02 2.7049E−02 2.8738E−02 A8 = — −1.5494E−04−1.5784E−03 −4.8008E−03 −1.9676E−02 −1.3990E−02 A10 = — −7.4992E−051.0910E−04 −2.2590E−03 7.7222E−03 4.1663E−03 A12 = — 2.0351E−066.8999E−05 2.4441E−03 −1.3588E−03 −6.3966E−04 A14 = — — — −6.7819E−047.9979E−05 3.8742E−05 A16 = — — — 6.2555E−05 — — Surface # 14 15 16 17 k= −1.0191E+01 −2.5236E+01 −7.5301E−01 −1.1325E+00 A4 = −1.7204E−02−6.0295E−03 −1.0068E−01 −7.7178E−02 A6 = 4.4444E−03 1.4208E−032.1108E−02 1.8417E−02 A8 = −3.9107E−03 −1.2160E−03 −2.6955E−03−3.4654E−03 A10 = 9.5751E−04 2.1390E−04 2.5898E−04 4.3552E−04 A12 =−1.4308E−04 −1.3750E−05 −1.8057E−05 −3.3201E−05 A14 = 1.0003E−052.7122E−07 7.6245E−07 1.3695E−06 A16 = 0.0000E+00 — −1.4060E−08−2.3245E−08

In the 9th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 9th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 17 and Table 18as the following values and satisfy the following conditions:

9th Embodiment f [mm] 6.35 (ΣAT + BL)/ΣCT 0.64 Fno 1.80 TL/ImgH 1.71HFOV [deg.] 34.4 TL [mm] 7.69 Nmax 1.639 Yc7/f(object-side surface 971)0.22 (V2 + V6)/V1 0.84 Yc7/f(image-side surface 972) 0.26 (R11 − R12)/0.01 Yc82/f 0.26 (R11 + R12) (R15 − R16)/ 0.28 f/fG1 0.70 (R15 + R16)f/R16 2.59 f/fG2 0.51 f/f1 1.21 f/fG3 −0.63 f1/f2 −0.56 f/f7 −0.18Y11/Y82 0.47 f/f8 −0.52 SD/TD 0.89 CT3/CT4 2.51 ATmax/ImgH 0.12 CT7/CT80.74 f/EPD 1.80 T23/T56 1.29 BL/EPD 0.34 T23/T78 0.78 TL/EPD 2.18

10th Embodiment

FIG. 19 is a schematic view of an image capturing unit according to the10th embodiment of the present disclosure. FIG. 20 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 10thembodiment. In FIG. 19, the image capturing unit includes thephotographing optical lens assembly (its reference numeral is omitted)of the present disclosure and an image sensor 1090. The photographingoptical lens assembly includes, in order from an object side to an imageside, a first lens element 1010, an aperture stop 1000, a second lenselement 1020, a third lens element 1030, a fourth lens element 1040, afifth lens element 1050, a sixth lens element 1060, a seventh lenselement 1070, an eighth lens element 1080, an IR-cut filter 1090 and animage surface 1095. A first lens group (reference numeral is omitted) ofthe photographing optical lens assembly includes the first lens element1010 and the second lens element 1020. A second lens group (referencenumeral is omitted) of the photographing optical lens assembly includesthe third lens element 1030, fourth lens element 1040 and the fifth lenselement 1050. A third lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the sixth lens element1060, the seventh lens element 1070 and the eighth lens element 1080.The image sensor 1097 is disposed on or near the image surface 1095 ofthe photographing optical lens assembly, and the photographing opticallens assembly has a total of eight lens elements (1010-1080). There isan air gap in a paraxial region between every two lens elements of thethird lens group that are adjacent to each other. In this embodiment,the first lens group has positive refractive power, the second lensgroup has positive refractive power, and the third lens group hasnegative refractive power.

The first lens element 1010 with positive refractive power has anobject-side surface 1011 being convex in a paraxial region thereof andan image-side surface 1012 being convex in a paraxial region thereof.The first lens element 1010 is made of plastic material and has theobject-side surface 1011 and the image-side surface 1012 being bothaspheric.

The second lens element 1020 with negative refractive power has anobject-side surface 1021 being convex in a paraxial region thereof andan image-side surface 1022 being concave in a paraxial region thereof.The second lens element 1020 is made of plastic material and has theobject-side surface 1021 and the image-side surface 1022 being bothaspheric.

The third lens element 1030 with negative refractive power has anobject-side surface 1031 being concave in a paraxial region thereof andan image-side surface 1032 being concave in a paraxial region thereof.The third lens element 1030 is made of plastic material and has theobject-side surface 1031 and the image-side surface 1032 being bothaspheric.

The fourth lens element 1040 with positive refractive power has anobject-side surface 1041 being convex in a paraxial region thereof andan image-side surface 1042 being convex in a paraxial region thereof.The fourth lens element 1040 is made of plastic material and has theobject-side surface 1041 and the image-side surface 1042 being bothaspheric.

The fifth lens element 1050 with positive refractive power has anobject-side surface 1051 being convex in a paraxial region thereof andan image-side surface 1052 being concave in a paraxial region thereof.The fifth lens element 1050 is made of plastic material and has theobject-side surface 1051 and the image-side surface 1052 being bothaspheric.

The sixth lens element 1060 with positive refractive power has anobject-side surface 1061 being concave in a paraxial region thereof andan image-side surface 1062 being convex in a paraxial region thereof.The sixth lens element 1060 is made of plastic material and has theobject-side surface 1061 and the image-side surface 1062 being bothaspheric.

The seventh lens element 1070 with negative refractive power has anobject-side surface 1071 being convex in a paraxial region thereof andan image-side surface 1072 being concave in a paraxial region thereof.The seventh lens element 1070 is made of plastic material and has theobject-side surface 1071 and the image-side surface 1072 being bothaspheric.

The eighth lens element 1080 with negative refractive power has anobject-side surface 1081 being convex in a paraxial region thereof andan image-side surface 1082 being concave in a paraxial region thereof.The seventh lens element 1080 is made of plastic material and has theobject-side surface 1081 and the image-side surface 1082 being bothaspheric. The image-side surface 1082 of the eighth lens element 1080has at least one inflection point.

The IR-cut filter 1090 is made of glass and located between the eighthlens element 1080 and the image surface 1095, and will not affect thefocal length of the photographing optical lens assembly.

The detailed optical data of the 10th embodiment are shown in Table 19and the aspheric surface data are shown in Table 20 below.

TABLE 19 10th Embodiment f = 6.14 mm, Fno = 1.85, HFOV = 35.0 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 2.979 (ASP) 0.980 Plastic 1.544 55.9 4.972 −26.178 (ASP) 0.035 3 Ape. Stop Plano 0.035 4 Lens 2 9.046 (ASP) 0.505Plastic 1.639 23.5 −10.00 5 3.663 (ASP) 0.404 6 Lens 3 −40.783 (ASP)0.220 Plastic 1.639 23.5 −36.78 7 55.598 (ASP) 0.087 8 Lens 4 18.951(ASP) 0.704 Plastic 1.544 55.9 24..01 9 −41.522 (ASP) 0.170 10 Lens 58.111 (ASP) 0.312 Plastic 1.544 55.9 43.60 11 12.158 (ASP) 0.268 12 Lens6 −5.241 (ASP) 0.608 Plastic 1.544 55.9 12.02 13 −3.028 (ASP) 0.295 14Lens 7 8.050 (ASP) 0.753 Plastic 1.544 55.9 −21.02 15 4.569 (ASP) 0.55316 Lens 8 5.287 (ASP) 0.731 Plastic 1.544 55.9 −8.84 17 2.395 (ASP)0.600 18 IR-cut filter Plano 0.328 Glass 1.517 64.2 — 19 Plano 0.236 20Image Plano — Note: Reference wavelength is 587.6 nm (d-line).

TABLE 20 Aspheric Coefficients Surface # 1 2 4 5 6 7 k = 1.1148E−01−6.2724E+00 −9.0000E+01 −2.7858E+01 9.0000E+01 5.7785E+01 A4 =8.8488E−04 −2.8771E−02 −4.1644E−02 2.3974E−02 −8.9616E−03 −1.1613E−03 A6= −2.6258E−03 3.7152E−02 4.3451E−02 −2.7845E−02 −3.2500E−03 2.5336E−03A8 = 2.3856E−03 −2.1633E−02 −2.3216E−02 2.1016E−02 1.5573E−03 — A10 =−1.2197E−03 6.9571E−03 7.0528E−03 −1.0072E−02 −1.0724E−03 — A12 =3.0873E−04 −1.1920E−03 −1.1181E−03 2.4771E−03 9.6120E−05 — A14 =−3.4098E−05 8.2403E−05 7.8527E−05 −2.5471E−04 −1.2877E−05 — Surface # 89 10 11 12 13 k = −9.0000E+01 9.0000E+01 −9.0000E+01 2.8087E+012.7305E+00 −1.2349E+01 A4 = −7.2005E−03 −1.5313E−02 −1.1144E−02−3.6581E−02 −1.2640E−02 −4.6138E−02 A6 = 2.0708E−03 −2.6600E−03−6.0561E−03 1.0973E−02 2.5183E−02 2.8088E−02 A8 = — −1.5811E−04−1.2628E−03 −4.9662E−03 −1.9182E−02 −1.3570E−02 A10 = — −1.2490E−043.1810E−04 −2.2111E−03 7.3637E−03 3.9669E−03 A12 = — 1.5688E−053.7125E−05 2.3378E−03 −1.2939E−03 −6.0252E−04 A14 = — — — −6.3497E−047.4233E−05 3.7516E−05 A16 = — — — 5.7425E−05 — — Surface # 14 15 16 17 k= −8.6451E+00 −3.3055E+01 −4.2717E−01 −1.7325E+00 A4 = −1.8503E−02−7.1996E−03 −9.6192E−02 −7.1224E−02 A6 = 5.1280E−03 2.1049E−032.0466E−02 1.7893E−02 A8 = −3.8425E−03 −1.1926E−03 −2.6027E−03−3.3474E−03 A10 = 9.0824E−04 2.0077E−04 2.4728E−04 4.1579E−04 A12 =−1.3407E−04 −1.2997E−05 −1.7061E−05 −3.1360E−05 A14 = 9.4084E−062.6626E−07 7.1256E−07 1.2815E−06 A16 = — — −1.3116E−08 −2.1579E−08

In the 10th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 10th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 19 and Table 20as the following values and satisfy the following conditions:

10th Embodiment f [mm] 6.14 (ΣAT + BL)/ΣCT 0.63 Fno 1.85 TL/ImgH 1.74HFOV [deg.] 35.0 TL [mm] 7.82 Nmax 1.639 Yc7/f(object-side surface 271)0.20 (V2 + V6)/V1 1.42 Yc7/f(image-side surface 272) 0.27 (R11 − R12)/0.27 Yc82/f 0.28 (R11 + R12) (R15 − R16)/ 0.38 f/fG1 0.77 (R15 + R16)f/R16 2.56 f/fG2 0.23 f/f1 1.23 f/fG3 −0.37 f1/f2 −0.50 f/f7 −0.29Y11/Y82 0.51 f/f8 −0.69 SD/TD 0.85 CT3/CT4 0.31 ATmax/ImgH 0.12 CT7/CT81.03 f/EPD 1.85 T23/T56 1.51 BL/EPD 0.35 T23/T78 0.73 TL/EPD 2.36

11th Embodiment

FIG. 21 is a schematic view of an image capturing unit according to the11th embodiment of the present disclosure. FIG. 22 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 11thembodiment. In FIG. 21, the image capturing unit includes thephotographing optical lens assembly (its reference numeral is omitted)of the present disclosure and an image sensor 1197. The photographingoptical lens assembly includes, in order from an object side to an imageside, an aperture stop 1100, a first lens element 1110, a second lenselement 1120, a third lens element 1130, a fourth lens element 1140, afifth lens element 1150, a sixth lens element 1160, a seventh lenselement 1170, an eighth lens element 1180, an IR-cut filter 1190 and animage surface 1195. A first lens group (reference numeral is omitted) ofthe photographing optical lens assembly includes the first lens element1110 and the second lens element 1120. A second lens group (referencenumeral is omitted) of the photographing optical lens assembly includesthe third lens element 1130, fourth lens element 1140 and the fifth lenselement 1150. A third lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the sixth lens element1160, the seventh lens element 1170 and the eighth lens element 1180.The image sensor 1197 is disposed on or near the image surface 1195 ofthe photographing optical lens assembly, and the photographing opticallens assembly has a total of eight lens elements (1110-1180). There isan air gap in a paraxial region between every two lens elements of thethird lens group that are adjacent to each other. In this embodiment,the first lens group has positive refractive power, the second lensgroup has negative refractive power, and the third lens group hasnegative refractive power.

The first lens element 1110 with positive refractive power has anobject-side surface 1111 being convex in a paraxial region thereof andan image-side surface 1112 being convex in a paraxial region thereof.The first lens element 1110 is made of plastic material and has theobject-side surface 1111 and the image-side surface 1112 being bothaspheric.

The second lens element 1120 with negative refractive power has anobject-side surface 1121 being concave in a paraxial region thereof andan image-side surface 1122 being convex in a paraxial region thereof.The second lens element 1120 is made of plastic material and has theobject-side surface 1121 and the image-side surface 1122 being bothaspheric.

The third lens element 1130 with negative refractive power has anobject-side surface 1131 being convex in a paraxial region thereof andan image-side surface 1132 being concave in a paraxial region thereof.The third lens element 1130 is made of plastic material and has theobject-side surface 1131 and the image-side surface 1132 being bothaspheric.

The fourth lens element 1140 with negative refractive power has anobject-side surface 1141 being convex in a paraxial region thereof andan image-side surface 1142 being concave in a paraxial region thereof.The fourth lens element 1140 is made of plastic material and has theobject-side surface 1141 and the image-side surface 1142 being bothaspheric.

The fifth lens element 1150 with positive refractive power has anobject-side surface 1151 being convex in a paraxial region thereof andan image-side surface 1152 being convex in a paraxial region thereof.The fifth lens element 1150 is made of plastic material and has theobject-side surface 1151 and the image-side surface 1152 being bothaspheric.

The sixth lens element 1160 with negative refractive power has anobject-side surface 1161 being concave in a paraxial region thereof andan image-side surface 1162 being convex in a paraxial region thereof.The sixth lens element 1160 is made of plastic material and has theobject-side surface 1161 and the image-side surface 1162 being bothaspheric.

The seventh lens element 1170 with positive refractive power has anobject-side surface 1171 being convex in a paraxial region thereof andan image-side surface 1172 being concave in a paraxial region thereof.The seventh lens element 1170 is made of plastic material and has theobject-side surface 1171 and the image-side surface 1172 being bothaspheric.

The eighth lens element 1180 with negative refractive power has anobject-side surface 1181 being convex in a paraxial region thereof andan image-side surface 1182 being concave in a paraxial region thereof.The eighth lens element 1180 is made of plastic material and has theobject-side surface 1181 and the image-side surface 1182 being bothaspheric. The image-side surface 1182 of the eighth lens element 1180has at least one inflection point.

The IR-cut filter 1190 is made of glass and located between the eighthlens element 1180 and the image surface 1195, and will not affect thefocal length of the photographing optical lens assembly.

The detailed optical data of the 11th embodiment are shown in Table 21and the aspheric surface data are shown in Table 22 below.

TABLE 21 11th Embodiment f = 8.50 mm, Fno = 1.65, HFOV = 34.4 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Ape. Stop Plano −0.941 2 Lens 1 3.940 (ASP)1.372 Plastic 1.544 55.9 7.09 3 −159.104 (ASP) 0.085 4 Lens 2 −30.053(ASP) 0.350 Plastic 1.639 23.5 −72.38 5 −86.207 (ASP) 0.035 6 Lens 34.758 (ASP) 0.454 Plastic 1.632 23.4 −18.99 7 3.282 (ASP) 0.650 8 Lens 419.021 (ASP) 0.403 Plastic 1.640 23.3 −178.90 9 16.176 (ASP) 0.286 10Lens 5 25.289 (ASP) 1.679 Plastic 1.544 55.9 25.12 11 −29.045 (ASP)0.407 12 Lens 6 −4.945 (ASP) 0.488 Plastic 1.639 23.5 −21.78 13 −7.966(ASP) 0.051 14 Lens 7 4.920 (ASP) 1.346 Plastic 1.544 55.9 18.40 158.744 (ASP) 0.600 16 Lens 8 5.758 (ASP) 1.305 Plastic 1.544 55.9 −16.1417 3.200 (ASP) 0.850 18 IR-cut filter Plano 0.300 Glass 1.517 64.2 — 19Plano 0.306 20 Image Plano — Note: Reference wavelength is 587.6 nm(d-line).

TABLE 22 Aspheric Coefficients Surface # 2 3 4 5 6 7 k = 1.2865E−015.0000E+01 −9.0000E+01 9.0000E+01 −2.2504E+01 −1.4212E+01 A4 =−3.4761E−04 −1.2266E−02 — — −1.4840E−02 1.0221E−02 A6 = −2.5199E−046.5425E−03 — — 7.3482E−03 −4.2282E−03 A8 = 1.7461E−04 −1.7990E−03 — —−1.8865E−03 1.7683E−03 A10 = −4.9841E−05 2.8240E−04 — — 2.8085E−04−4.1315E−04 A12 = 6.7992E−06 −2.3274E−05 — — −2.2536E−05 4.7678E−05 A14= −3.6949E−07 7.5019E−07 — — 7.7267E−07 −2.0558E−06 Surface # 8 9 10 1112 13 k = 2.6616E+01 2.9627E+01 −2.8713E+01 6.7529E+01 7.4491E−01−5.4044E+00 A4 = −9.8752E−04 7.2552E−04 −3.2784E−03 −1.3704E−02−4.2131E−03 −1.4501E−02 A6 = −1.7469E−04 −3.1698E−04 −2.9428E−042.3327E−03 4.2125E−03 4.8408E−03 A8 = 8.2742E−05 −1.1546E−05 −1.5126E−05−3.9459E−04 −1.5529E−03 −1.1139E−03 A10 = −3.9896E−05 −1.0942E−067.0476E−06 −8.9049E−05 2.9528E−04 1.5855E−04 A12 = 3.1285E−06 9.1424E−077.1799E−07 4.5113E−05 −2.5309E−05 −1.1892E−05 A14 = −6.7955E−08 — —−6.0673E−06 6.9653E−07 3.5594E−07 A16 = — — — 2.6922E−07 — — Surface #14 15 16 17 k = −1.4434E+01 −3.6876E+01 −6.6676E−01 −9.6814E−01 A4 =−4.8537E−03 −1.5739E−03 −3.3474E−02 −2.6279E−02 A6 = 8.0475E−043.0754E−04 3.4348E−03 3.0112E−03 A8 = −3.0810E−04 −1.0049E−04−2.1322E−04 −2.7412E−04 A10 = 3.6146E−05 8.1661E−06 9.9226E−061.6683E−05 A12 = −2.6803E−06 −2.5306E−07 −3.3485E−07 −6.1600E−07 A14 =9.5162E−08 2.5346E−09 6.8565E−09 1.2309E−08 A16 = — — −6.1344E−11−1.0117E−10

In the 11th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 11th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 21 and Table 22as the following values and satisfy the following conditions:

11th Embodiment f [mm] 8.50 (ΣAT + BL)/ΣCT 0.48 Fno 1.65 TL/ImgH 1.83HFOV [deg.] 34.4 TL [mm] 10.97 Nmax 1.640 Yc7/f(object-side surface 271)0.25 (V2 + V6)/V1 0.84 Yc7/f(image-side surface 272) 0.28 (R11 − R12)/−0.23 Yc82/f 0.32 (R11 + R12) (R15 − R16)/ 0.29 f/fG1 1.10 (R15 + R16)f/R16 2.66 f/fG2 −0.14 f/f1 1.20 f/fG3 −0.43 f1/f2 −0.10 f/f7 0.46Y11/Y82 0.48 f/f8 −0.53 SD/TD 0.90 CT3/CT4 1.13 ATmax/ImgH 0.11 CT7/CT81.03 f/EPD 1.65 T23/T56 0.09 BL/EPD 0.28 T23/T78 0.06 TL/EPD 2.13

12th Embodiment

FIG. 23 is a schematic view of an image capturing unit according to the3rd embodiment of the present disclosure. FIG. 24 shows, in order fromleft to right, spherical aberration curves, astigmatic field curves anda distortion curve of the image capturing unit according to the 3rdembodiment. In FIG. 23, the image capturing unit includes thephotographing optical lens assembly (its reference numeral is omitted)of the present disclosure and an image sensor 1297. The photographingoptical lens assembly includes, in order from an object side to an imageside, a first lens element 1210, an aperture stop 1200, a second lenselement 1220, a third lens element 1230, a fourth lens element 1240, afifth lens element 1250, a sixth lens element 1260, a seventh lenselement 1270, an eighth lens element 1280, an IR-cut filter 1290 and animage surface 1295. A first lens group (reference numeral is omitted) ofthe photographing optical lens assembly includes the first lens element1210 and the second lens element 1220. A second lens group (referencenumeral is omitted) of the photographing optical lens assembly includesthe third lens element 1230, fourth lens element 1240 and the fifth lenselement 1250. A third lens group (reference numeral is omitted) of thephotographing optical lens assembly includes the sixth lens element1260, the seventh lens element 1270 and the eighth lens element 1280.The image sensor 1297 is disposed on or near the image surface 1295 ofthe photographing optical lens assembly and the photographing opticallens assembly has a total of eight lens elements (1210-1280). There isan air gap in a paraxial region between every two lens elements of thethird lens group that are adjacent to each other. In this embodiment,the first lens group has positive refractive power, the second lensgroup has positive refractive power, and the third lens group hasnegative refractive power.

The first lens element 1210 with positive refractive power has anobject-side surface 1211 being convex in a paraxial region thereof andan image-side surface 1212 being concave in a paraxial region thereof.The first lens element 1210 is made of plastic material and has theobject-side surface 1211 and the image-side surface 1212 being bothaspheric.

The second lens element 1220 with negative refractive power has anobject-side surface 1221 being convex in a paraxial region thereof andan image-side surface 1222 being concave in a paraxial region thereof.The second lens element 1220 is made of plastic material and has theobject-side surface 1221 and the image-side surface 1222 being bothaspheric.

The third lens element 1230 with positive refractive power has anobject-side surface 1231 being convex in a paraxial region thereof andan image-side surface 1232 being concave in a paraxial region thereof.The third lens element 1230 is made of plastic material and has theobject-side surface 1231 and the image-side surface 1232 being bothaspheric.

The fourth lens element 1240 with positive refractive power has anobject-side surface 1241 being convex in a paraxial region thereof andan image-side surface 1242 being convex in a paraxial region thereof.The fourth lens element 1240 is made of plastic material and has theobject-side surface 1241 and the image-side surface 1242 being bothaspheric.

The fifth lens element 1250 with positive refractive power has anobject-side surface 1251 being concave in a paraxial region thereof andan image-side surface 1252 being convex in a paraxial region thereof.The fifth lens element 1250 is made of plastic material and has theobject-side surface 1251 and the image-side surface 1252 being bothaspheric.

The sixth lens element 1260 with negative refractive power has anobject-side surface 1261 being concave in a paraxial region thereof andan image-side surface 1262 being concave in a paraxial region thereof.The sixth lens element 1260 is made of plastic material and has theobject-side surface 1261 and the image-side surface 1262 being bothaspheric.

The seventh lens element 1270 with positive refractive power has anobject-side surface 1271 being convex in a paraxial region thereof andan image-side surface 1272 being convex in a paraxial region thereof.The seventh lens element 1270 is made of plastic material and has theobject-side surface 1271 and the image-side surface 1272 being bothaspheric.

The eighth lens element 1280 with negative refractive power has anobject-side surface 1281 being concave in a paraxial region thereof andan image-side surface 1282 being concave in a paraxial region thereof.The eighth lens element 1280 is made of plastic material and has theobject-side surface 1281 and the image-side surface 1282 being bothaspheric. The image-side surface 1282 of the eighth lens element 1280has at least one inflection point.

The IR-cut filter 1290 is made of glass and located between the eighthlens element 1280 and the image surface 1295, and will not affect thefocal length of the photographing optical lens assembly.

The detailed optical data of the 12th embodiment are shown in Table 23and the aspheric surface data are shown in Table 24 below.

TABLE 23 12th Embodiment f = 8.58 mm, Fno = 2.50, HFOV = 33.1 deg. FocalSurface # Curvature Radius Thickness Material Index Abbe # Length 0Object Plano Infinity 1 Lens 1 4.025 (ASP) 1.071 Plastic 1.535 55.7 8.152 47.762 (ASP) 0.323 3 Ape. Stop Plano −0.070 4 Lens 2 8.074 (ASP) 0.415Plastic 1.660 20.4 −18.33 5 4.743 (ASP) 1.269 6 Lens 3 45.587 (ASP)0.291 Plastic 1.660 20.4 390.73 7 55.237 (ASP) 0.112 8 Lens 4 74.994(ASP) 1.284 Plastic 1.530 55.8 75.71 9 −85.777 (ASP) 0.502 10 Lens 5−62.668 (ASP) 1.014 Plastic 1.535 55.7 90.95 11 −27.546 (ASP) 0.077 12Lens 6 −13.025 (ASP) 0.364 Plastic 1.583 30.2 −11.17 13 13.170 (ASP)0.128 14 Lens 7 4.412 (ASP) 1.661 Plastic 1.530 55.8 3.83 15 −3.275(ASP) 0.828 16 Lens 8 −9.566 (ASP) 0.466 Plastic 1.535 55.7 −3.63 172.475 (ASP) 1.050 18 IR-cut filter Plano 0.450 Glass 1.517 64.2 — 19Plano 0.336 20 Image Plano — Note: Reference wavelength is 587.6 nm(d-line).

TABLE 24 Aspheric Coefficients Surface # 1 2 4 5 6 7 k = 2.8146E−01−4.9781E+01 −3.3149E+01 −1.6470E+01 −1.6022E+00 −9.0000E+01 A4 =7.8489E−04 −5.1830E−03 −1.2582E−02 4.4560E−03 −3.5358E−03 −1.5971E−03 A6= −1.3362E−04 2.5389E−03 6.0690E−03 −4.8323E−04 −3.8943E−04 −6.3146E−04A8 = 1.3044E−04 −5.8842E−04 −2.1962E−03 −2.3034E−04 −6.1707E−05−4.4227E−05 A10 = −3.4878E−05 7.1879E−05 6.7645E−04 7.6887E−04−1.0760E−05 −7.4737E−06 A12 = 3.9427E−06 4.0742E−06 −1.1183E−04−3.4174E−04 −1.1789E−06 2.6590E−06 A14 = 9.1659E−08 −1.2069E−066.2396E−06 5.0002E−05 7.2359E−07 Surface # 8 9 10 11 12 13 k =9.0000E+01 4.5783E+01 7.5528E+01 6.0649E+01 9.8813E+00 −6.7498E+01 A4 =−4.2452E−03 −9.6445E−03 −1.1147E−02 −1.4840E−02 −4.5780E−03 −1.0623E−02A6 = −1.5013E−04 −4.8947E−04 −7.9172E−04 8.4013E−04 2.2166E−032.4305E−03 A8 = −2.3635E−05 4.8002E−05 −5.6164E−05 −1.6690E−04−7.1648E−04 −4.9933E−04 A10 = 1.6089E−05 −1.0433E−06 1.1729E−05−2.9549E−05 1.0484E−04 5.7349E−05 A12 = −1.4472E−06 −1.7797E−072.0984E−07 1.3009E−05 −7.0625E−06 −3.3647E−06 A14 = — — — −1.3914E−061.6277E−07 7.9013E−08 A16 = — — — 4.9385E−08 — — Surface # 14 15 16 17 k= −1.0764E+01 −6.0035E+00 −1.4276E+01 −6.3665E+00 A4 = −1.3272E−035.5529E−03 −1.9481E−02 −1.1993E−02 A6 = 6.1595E−04 −4.0632E−051.9029E−03 1.5301E−03 A8 = −1.5395E−04 −4.4555E−05 −9.7463E−05−1.2139E−04 A10 = 1.4466E−05 2.9303E−06 3.5196E−06 5.9687E−06 A12 =−7.1232E−07 −7.3162E−08 −9.5955E−08 −1.7585E−07 A14 = 1.4375E−084.8414E−10 1.6256E−09 2.7743E−09 A16 = — — −1.1112E−11 −1.7713E−11

In the 12th embodiment, the equation of the aspheric surface profiles ofthe aforementioned lens elements is the same as the equation of the 1stembodiment. Also, the definitions of these parameters shown in thefollowing table are the same as those stated in the 1st embodiment withcorresponding values for the 12th embodiment, so an explanation in thisregard will not be provided again.

Moreover, these parameters can be calculated from Table 23 and Table 24as the following values and satisfy the following conditions:

12th Embodiment f [mm] 8.58 (ΣAT + BL)/ΣCT 0.76 Fno 2.50 TL/ImgH 1.96HFOV [deg.] 33.1 TL [mm] 11.57 Nmax 1.660 Yc7/f(object-side surface 271)0.35 (V2 + V6)/V1 0.91 Yc7/f(image-side surface 272) — (R11 − R12)/−180.78 Yc82/f 0.42 (R11 + R12) (R15 − R16)/ 1.70 f/fG1 0.68 (R15 + R16)f/R16 3.47 f/fG2 0.23 f/f1 1.05 f/fG3 −0.19 f1/f2 −0.44 f/f7 2.24Y11/Y82 0.42 f/f8 −2.37 SD/TD 0.86 CT3/CT4 0.23 ATmax/ImgH 0.22 CT7/CT83.56 f/EPD 2.50 T23/T56 16.48 BL/EPD 0.53 T23/T78 1.53 TL/EPD 3.37

The foregoing image capturing unit is able to be installed in, but notlimited to, an electronic device, including smart phones, tabletpersonal computers and wearable devices.

According to the present disclosure, the photographing optical lensassembly includes, in order from the object side to the image side, thefirst lens group, the second lens group and the third lens group. Thefirst lens group includes two lens elements, the second lens groupincludes three lens elements, and the third lens group includes threelens elements. Therefore, the refractive power distribution of the firstlens group, the second lens group and the third lens group is favorablefor adjusting the optical parameters in a design of the photographingoptical lens assembly so as to effectively improve the image quality.When specific condition is satisfied, it is favorable for reducing theback focal length of the photographing optical lens assembly, andthereby maintaining a compact size thereof. The optical parameters ofthe photographing optical lens assembly with some features of the lenselements, such as curvature radii of the lens elements, are favorablefor applying the photographing optical lens assembly to both theconventional electronic device and the high-end electronic device.According to the present disclosure, the photographing optical lensassembly simultaneously satisfies the requirements of good image qualityand compact size even though it is applied to the electronic device withhigh-end specifications.

The foregoing description, for the purpose of explanation, has beendescribed with reference to specific embodiments. It is to be noted thatTABLES 1-24 show different data of the different embodiments; however,the data of the different embodiments are obtained from experiments. Theembodiments were chosen and described in order to best explain theprinciples of the disclosure and its practical applications, to therebyenable others skilled in the art to best utilize the disclosure andvarious embodiments with various modifications as are suited to theparticular use contemplated. The embodiments depicted above and theappended drawings are exemplary and are not intended to be exhaustive orto limit the scope of the present disclosure to the precise formsdisclosed. Many modifications and variations are possible in view of theabove teachings.

What is claimed is:
 1. A photographing optical lens assembly comprisingeight lens elements, the eight lens elements being, in order from anobject side to an image side, a first lens element, a second lenselement, a third lens element, a fourth lens element, a fifth lenselement, a sixth lens element, a seventh lens element and an eighth lenselement; wherein the seventh lens element has an image-side surfacebeing concave in a paraxial region thereof, at least one of anobject-side surface and an image-side surface of the eighth lens elementhas at least one inflection point; wherein the photographing opticallens assembly further comprises an aperture stop, a focal length of thephotographing optical lens assembly is f, an entrance pupil diameter ofthe photographing optical lens assembly is EPD, a maximum refractiveindex among the lens elements of the photographing optical lens assemblyis Nmax, an axial distance between the aperture stop and an image-sidesurface of the lens element closest to an image surface is SD, an axialdistance between an object-side surface of the lens element closest toan imaged object and the image-side surface of the lens element closestto the image surface is TD, and the following conditions are satisfied:f/EPD<2.60;1.639≤Nmax<1.70; and0.70<SD/TD<1.10.
 2. The photographing optical lens assembly of claim 1,wherein the image-side surface of the eighth lens element is concave ina paraxial region thereof.
 3. The photographing optical lens assembly ofclaim 1, wherein the first lens element has positive refractive power,and the second lens element has negative refractive power.
 4. Thephotographing optical lens assembly of claim 1, wherein the focal lengthof the photographing optical lens assembly is f, the entrance pupildiameter of the photographing optical lens assembly is EPD, half of amaximal field of view of the photographing optical lens assembly isHFOV, and the following conditions are satisfied:f/EPD≤2.20; and30.0 degrees<HFOV<50.0 degrees.
 5. The photographing optical lensassembly of claim 1, wherein an axial distance between the object-sidesurface of the lens element closest to the imaged object and the imagesurface is TL, the entrance pupil diameter of the photographing opticallens assembly is EPD, and the following condition is satisfied:1.5<TL/EPD<4.0.
 6. The photographing optical lens assembly of claim 1,wherein an axial distance between the object-side surface of the lenselement closest to the imaged object and the image surface is TL, andthe following condition is satisfied:TL<12.0 millimeters.
 7. The photographing optical lens assembly of claim1, wherein an axial distance between the object-side surface of the lenselement closest to the imaged object and the image surface is TL, amaximum image height of the photographing optical lens assembly is ImgH,and the following condition is satisfied:TL/ImgH<2.1.
 8. The photographing optical lens assembly of claim 1,wherein the focal length of the photographing optical lens assembly isf, a focal length of the eighth lens element is f8, and the followingcondition is satisfied:−2.8<f/f8<1.0.
 9. The photographing optical lens assembly of claim 1,wherein at least one of an object-side surface and the image-sidesurface of the seventh lens element has at least one critical point. 10.The photographing optical lens assembly of claim 1, wherein theimage-side surface of the eighth lens element has at least one criticalpoint, and there is an air gap in a paraxial region between every two ofthe eight lens elements that are adjacent to each other.
 11. An imagecapturing unit, comprising: the photographing optical lens assembly ofclaim 1; and an image sensor, wherein the image sensor is disposed onthe image side of the photographing optical lens assembly.
 12. Aphotographing optical lens assembly comprising eight lens elements, theeight lens elements being, in order from an object side to an imageside, a first lens element, a second lens element, a third lens element,a fourth lens element, a fifth lens element, a sixth lens element, aseventh lens element and an eighth lens element; wherein the seventhlens element has an image-side surface being concave in a paraxialregion thereof, the eighth lens element has negative refractive power,at least one of an object-side surface and an image-side surface of theeighth lens element is aspheric; at least one of the object-side surfaceand the image-side surface of the eighth lens element has at least oneinflection point; wherein a focal length of the photographing opticallens assembly is f, an entrance pupil diameter of the photographingoptical lens assembly is EPD, a maximum refractive index among the lenselements of the photographing optical lens assembly is Nmax, a curvatureradius of the object-side surface of the eighth lens element is R15, acurvature radius of the image-side surface of the eighth lens element isR16, and the following conditions are satisfied:f/EPD<2.60;1.639≤Nmax<1.70; and−0.9<(R15−R16)/(R15+R16)<10.
 13. The photographing optical lens assemblyof claim 12, wherein the object-side surface of the eighth lens elementis convex in a paraxial region thereof.
 14. The photographing opticallens assembly of claim 12, wherein the focal length of the photographingoptical lens assembly is f, the entrance pupil diameter of thephotographing optical lens assembly is EPD, and the following conditionis satisfied:f/EPD≤2.20.
 15. The photographing optical lens assembly of claim 12,wherein the curvature radius of the object-side surface of the eighthlens element is R15, the curvature radius of the image-side surface ofthe eighth lens element is R16, and the following condition issatisfied:0.03≤(R15−R16)/(R15+R16)≤1.21.
 16. The photographing optical lensassembly of claim 12, wherein a maximum effective radius of anobject-side surface of the first lens element is Y11, a maximumeffective radius of the image-side surface of the eighth lens element isY82, and the following condition is satisfied:0.20<Y11/Y82<0.70.
 17. The photographing optical lens assembly of claim12, wherein a maximum axial distance among all axial distances betweenevery two lens elements of the photographing optical lens assembly thatare adjacent to each other is ATmax, a maximum image height of thephotographing optical lens assembly is ImgH, and the following conditionis satisfied:ATmax/ImgH<0.30.
 18. The photographing optical lens assembly of claim12, wherein the focal length of the photographing optical lens assemblyis f, a focal length of the first lens element is f1, a focal length ofthe second lens element is f2, the curvature radius of the image-sidesurface of the eighth lens element is R16, and the following conditionsare satisfied:−1.0<f1/f2<0.7; and0.3<f/R16≤3.16.
 19. The photographing optical lens assembly of claim 12,wherein a central thickness of the seventh lens element is CT7, acentral thickness of the eighth lens element is CT8, and the followingcondition is satisfied:0.71≤CT7/CT8≤1.23.
 20. The photographing optical lens assembly of claim12, wherein the maximum refractive index among the lens elements of thephotographing optical lens assembly is Nmax, and the following conditionis satisfied:1.660≤Nmax<1.70.
 21. The photographing optical lens assembly of claim12, wherein each of the eight lens elements is made of plastic material,at least one of an object-side surface and the image-side surface of theseventh lens element has at least one critical point.
 22. Aphotographing optical lens assembly comprising eight lens elements, theeight lens elements being, in order from an object side to an imageside, a first lens element, a second lens element, a third lens element,a fourth lens element, a fifth lens element, a sixth lens element, aseventh lens element and an eighth lens element; wherein the eighth lenselement has an image-side surface being concave in a paraxial regionthereof, at least one of an object-side surface and the image-sidesurface of the eighth lens element is aspheric, the image-side surfaceof the eighth lens element has at least one critical point, and theimage-side surface of the eighth lens element has at least oneinflection point; wherein a focal length of the photographing opticallens assembly is f, an entrance pupil diameter of the photographingoptical lens assembly is EPD, an axial distance between an object-sidesurface of the lens element closest to an imaged object and an imagesurface is TL, a maximum image height of the photographing optical lensassembly is ImgH, a vertical distance between the at least one criticalpoint and an optical axis is Yc82, and the following conditions aresatisfied:f/EPD≤2.20;TL/ImgH<2.1; and0.10<Yc82/f<0.80.
 23. The photographing optical lens assembly of claim22, wherein an axial distance between an image-side surface of the lenselement closest to the image surface and the image surface is BL, theentrance pupil diameter of the photographing optical lens assembly isEPD, and the following condition is satisfied:0.10<BL/EPD<0.70.
 24. The photographing optical lens assembly of claim22, wherein a sum of every axial distance between every two lenselements of the photographing optical lens assembly that are adjacent toeach other is ΣAT, an axial distance between an image-side surface ofthe lens element closest to the image surface and the image surface isBL, a sum of central thicknesses of the lens elements of thephotographing optical lens assembly is ΣCT, and the following conditionis satisfied:(ΣAT+BL)/ΣCT<0.80.
 25. The photographing optical lens assembly of claim22, wherein a curvature radius of an object-side surface of the sixthlens element is R11, a curvature radius of an image-side surface of thesixth lens element is R12, and the following condition is satisfied:−1.88≤(R11−R12)/(R11+R12)≤0.27.
 26. The photographing optical lensassembly of claim 22, wherein a curvature radius of the object-sidesurface of the eighth lens element is R15, a curvature radius of theimage-side surface of the eighth lens element is R16, and the followingcondition is satisfied:0.03≤(R15−R16)/(R15+R16)≤1.70.
 27. The photographing optical lensassembly of claim 22, wherein the focal length of the photographingoptical lens assembly is f, a focal length of the first lens element isf1, and the following condition is satisfied:0<f/f1<1.5.
 28. The photographing optical lens assembly of claim 22,wherein at least one of an object-side surface and an image-side surfaceof the seventh lens element has at least one critical point, a verticaldistance between the at least one critical point and the optical axis isYc7, the focal length of the photographing optical lens assembly is f,and the following condition is satisfied:0.10<Yc7/f<0.60.